SSM management: start/deploy SSM

[mpeuster]

The SSM was previously pulled/imported by the on-boarding procedure

Start a SSM given as a Docker container and ensure that it can connect to a given message broker to communicate with the executive plugin.

For now we start the Docker container in the same Docker environment as all the other MANO plugins. BUT: This should be configurable so that we can run SSMs in an isolated Docker environment later.

See: http://wiki.sonata-nfv.eu/index.php/Son-mano-base

[smendel]

The issue is outdated and does not reflect the current plan for the first year demo.