remove stager client

2 year old code that we don't actually use

Signed-off-by: Eric Malm <emalm@pivotallabs.com>
Signed-off-by: Glenn Oppegard <goppegard@pivotallabs.com>
bump cf-message-bus to fix nats reconnect bug

[finishes #54338464]

Signed-off-by: Glenn Oppegard <goppegard@pivotallabs.com>