PyLabs: Return RC mapping after cluster start/restart

See: ARAKOON-383
See: http://jira.incubaid.com/browse/ARAKOON-383
Fixes: ARAKOON-409
See: http://jira.incubaid.com/browse/ARAKOON-409
Merge pull request #89 from Incubaid/ARAKOON-409

PyLabs: Return RC mapping after cluster start/restart