Output lint summary after build

[nicholy]

Additional feature to the linting changes to show a summary of the generated lints if any exists.

Ex:

Completed builds:
   temp-pkg/1.0.3/src
   temp-pkg/1.0.3/AKCOQQ5Q variant 0, {arch: x86_64, centos: 7, distro: centos, os: linux, python: 2.7}
   temp-pkg/1.0.3/AHASMWKK variant 1, {arch: x86_64, centos: 7, distro: centos, os: linux, python: 3.7}
Lints:
 WARN temp-pkg/1.0.3 Unrecognized key: envionment. (Did you mean: 'environment'?)