Add use_ssl option in contrail plugin config

Use SSl for connection to OpenContrail API. SSL for OC is
added only for OC 4.X versions: Ocata, Pike, Queens releases are
supported.

Depends-On: https://gerrit.mcp.mirantis.com/#/c/43615/
Change-Id: I14247a1f789820bed64cb4aa4526d6f81b31c602
Related-PROD: PROD-29907
3 files changed