#Add -v option to install\update agent command

# Why is this change needed?
Customers should be able to install custom version of the agent if they need to

# How does it address the issue?
Add '-v', '--version' option to install\update command:

1. Windows:
```
powershell.exe -Command Read-S3Object -BucketName aws-codedeploy-us-east-1 -Key releases/codedeploy-agent-1.0.1.1095.msi -File c:\temp\codedeploy-agent.msi
```
test: `sc qdescription codedeployagent`
output: CodeDeploy Host Agent Service v1.0.1.1095

2. Linux:
```
sudo ./install auto -v releases/codedeploy-agent-1.0-1.1095.noarch.rpm
```
test `sudo yum info codedeploy-agent`
output: *Release     : 1.1095*

```
sudo ./update auto --version releases/codedeploy-agent-1.0-1.1352.noarch.rpm
```
test `sudo yum info codedeploy-agent`
output: *Release     : 1.1352*

3. Ubuntu:
```
sudo ./install auto -v releases/codedeploy-agent_1.0-1.1095_all.deb
```
test `sudo dpkg -s codedeploy-agent`
output: *Version: 1.0-1.1095*

```
sudo ./update auto --version releases/codedeploy-agent_1.0-1.1352_all.deb
```
test `sudo dpkg -s codedeploy-agent`
output: *Version: 1.0-1.1352*

# How was this tested ?
* On instances with the commands above
* Linux:
```
sudo ./update auto
```
test: `sudo yum info codedeploy-agent`
output: *Release     : 1.1597*

```
sudo ./install auto
```
test `sudo yum info codedeploy-agent`
output: *Release     : 1.1597*

* Ubuntu:
```
sudo ./update auto
```
test: `sudo dpkg -s codedeploy-agent`
output: *Version: 1.0-1.1597*

```
sudo ./install auto
```
test `sudo dpkg -s codedeploy-agent`
output: *Version: 1.0-1.1597*

cr https://code.amazon.com/reviews/CR-20081000

Author: Alena Kastsiukavets

bin/install

@@ -135,9 +135,16 @@ EOF
     @sanity_check = false
     @reexeced = false
     @http_proxy = nil
+    @target_version_arg = nil
 
     @args = Array.new(ARGV)
-    opts = GetoptLong.new(['--sanity-check', GetoptLong::NO_ARGUMENT], ['--help', GetoptLong::NO_ARGUMENT], ['--re-execed', GetoptLong::NO_ARGUMENT], ['--proxy', GetoptLong::OPTIONAL_ARGUMENT])
+    opts = GetoptLong.new(
+      ['--sanity-check', GetoptLong::NO_ARGUMENT],
+      ['--help', GetoptLong::NO_ARGUMENT],
+      ['--re-execed', GetoptLong::NO_ARGUMENT],
+      ['--proxy', GetoptLong::OPTIONAL_ARGUMENT],
+      ['-v', '--version', GetoptLong::OPTIONAL_ARGUMENT]
+    )
     opts.each do |opt, args|
       case opt
       when '--sanity-check'
@@ -150,6 +157,8 @@ EOF
         if (args != '')
           @http_proxy = args
         end
+      when '-v' || '--version'
+        @target_version_arg = args
       end
     end
     if (ARGV.length < 1)
@@ -273,10 +282,7 @@ end
     end
   end
 
-  def install_from_s3(region, bucket, version_file_key, type, install_cmd)
-    version_data = get_version_file_from_s3(region, bucket, version_file_key)
-
-    package_key = version_data[type]
+  def install_from_s3(region, bucket, package_key, install_cmd)
     package_base_name = File.basename(package_key)
     package_extension = File.extname(package_base_name)
     package_name = File.basename(package_base_name, package_extension)
@@ -309,6 +315,20 @@ end
     end
   end
 
+  def get_target_version(target_version, type, region, bucket)
+    if target_version.nil?
+      version_file_key = 'latest/VERSION'
+      version_data = get_version_file_from_s3(region, bucket, version_file_key)
+      if version_data.include? type
+        return version_data[type]
+      else
+        @log.error("Unsupported package type '#{type}'")
+        exit(1)
+      end
+    end
+    return target_version
+  end
+
   @log.info("Starting update check.")
 
   if (@type == 'auto')
@@ -347,21 +367,21 @@ end
 
   region = get_region
   bucket = "aws-codedeploy-#{region}"
-  version_file_key = 'latest/VERSION'
+
+  target_version = get_target_version(@target_version_arg, @type, region, bucket)
 
   case @type
   when 'help'
     usage
   when 'rpm'
     running_version = `rpm -q codedeploy-agent`
     running_version.strip!
-    target_version = get_version_file_from_s3(region, bucket, version_file_key)['rpm']
     if target_version.include? running_version
       @log.info('Running version matches target version, skipping install')
     else
       #use -y to answer yes to confirmation prompts
       install_cmd = ['/usr/bin/yum', '-y', 'localinstall']
-      install_from_s3(region, bucket, version_file_key, @type, install_cmd)
+      install_from_s3(region, bucket, target_version, install_cmd)
       do_sanity_check('/sbin/service')
     end
   when 'deb'
@@ -374,20 +394,19 @@ end
       running_version = "No running version"
     end
     @log.info("Running version " + running_version)
-    target_version = get_version_file_from_s3(region, bucket, version_file_key)['deb']
     if target_version.include? running_version
       @log.info('Running version matches target version, skipping install')
     else
       #use -n for non-interactive mode
       #use -o to not overwrite config files unless they have not been changed
       install_cmd = ['/usr/bin/gdebi', '-n', '-o', 'Dpkg::Options::=--force-confdef', '-o', 'Dkpg::Options::=--force-confold']
-      install_from_s3(region, bucket, version_file_key, @type, install_cmd)
+      install_from_s3(region, bucket, target_version, install_cmd)
       do_sanity_check('/usr/sbin/service')
     end
   when 'zypper'
     #use -n for non-interactive mode
     install_cmd = ['/usr/bin/zypper', 'install', '-n']
-    install_from_s3(region, bucket, version_file_key, 'rpm', install_cmd)
+    install_from_s3(region, bucket, target_version, install_cmd)
   else
     @log.error("Unsupported package type '#{@type}'")
     exit(1)

bin/update

@@ -148,11 +148,13 @@ EOF
     @http_proxy = nil
     @downgrade = false
     @upgrade = false
+    @target_version_arg = nil
 
     @args = Array.new(ARGV)
     opts = GetoptLong.new(['--sanity-check', GetoptLong::NO_ARGUMENT], ['--help', GetoptLong::NO_ARGUMENT],
                           ['--re-execed', GetoptLong::NO_ARGUMENT], ['--proxy', GetoptLong::OPTIONAL_ARGUMENT],
-                          ['--downgrade', GetoptLong::NO_ARGUMENT], ['--upgrade', GetoptLong::NO_ARGUMENT])
+                          ['--downgrade', GetoptLong::NO_ARGUMENT], ['--upgrade', GetoptLong::NO_ARGUMENT],
+                          ['-v', '--version', GetoptLong::OPTIONAL_ARGUMENT])
     opts.each do |opt, args|
       case opt
       when '--sanity-check'
@@ -169,6 +171,8 @@ EOF
         if (args != '')
           @http_proxy = args
         end
+      when '-v' || '--version'
+        @target_version_arg = args
       end
     end
 
@@ -550,7 +554,10 @@ EOF
   end
 
   running_version = running_version(@type)
-  target_version = target_version(@type)
+  target_version = @target_version_arg
+  if target_version.nil?
+    target_version = target_version(@type)
+  end
   if target_version.include? running_version
     @log.info("Running version, #{running_version}, matches target version, #{target_version}, skipping install")
   else