Makes an initial conn check directly to MidonetApi.

The initial connection check with MidoNet API was impliemented as a
MidonetCLI command, which ended up printing a garbage that is a result
of the connection check query to the API. This CL performs querying
directly via MidonetCLI to avoid cluttering.

Fix MN-1231
Merge branch 'dev/tomohiko/mn-1231/20140207' of github.com:midokura/python-midonetclient into dev/tomohiko/mn-1231/20140207

Conflicts:
	src/bin/midonet-cli