Follow convention for main tests [#79218040]

Signed-off-by: Abhijit Hiremagalur <abhi@pivotal.io>
Use diegonats.NATSClient [#79543220]
Stager uses HTTP to post staging response to CC

[#80217622]

Signed-off-by: Ted Young <tyoung@pivotal.io>
Introduce CC api client for staging responses

Signed-off-by: Ted Young <tyoung@pivotal.io>
use standard flag name for ccAddress
api_client takes cc_messages instead of bytes