SSH tunnel support

[lvim-tech]

{
        "id": "db",
        "url": "mongodb://user:pass@localhost:28017/db?connect=direct",
        "name": "db",
        "type": "mongo",
        "ssh": {
            "user": "root",
            "host": "xx.xx.xx.xx",
            "remote_port": 27017,
            "local_port": 28017,
            "ssh_file": "/home/user/.ssh/netera",
            "options": [
                "-4",
                "-N",
                "-L"
            ]
        }
},

or

{
        "id": "db",
        "url": "mongodb://user:pass@localhost:28017/db?connect=direct",
        "name": "db",
        "type": "mongo",
        "ssh": {
            "user": "root",
            "host": "xx.xx.xx.xx",
            "remote_port": 27017,
            "local_port": 28017,
            "password": "pass",
            "options": [
                "-4",
                "-N",
                "-L"
            ]
        }
},

[phdah]

#56