Small improvments

o lamda not needed, VALIDATORS doesn't need to be present
o check is host contains data befor adding it
o only remove cinder-volumes if there was an error creating it,
  no if we failed to connect with ssh

Change-Id: I4728373b7dfa9f3b7470daa9ec546608219bc0de
Renamed CONFIG_SATELLITE_PROXY_HOST to CONFIG_SATELLITE_PROXY

Change-Id: Iff4efc68c294980f1174a74114613a96bdb8c01d
Merge "Renamed CONFIG_SATELLITE_PROXY_HOST to CONFIG_SATELLITE_PROXY" into folsom