Fixing build by stubbing out locks and not connecting to Redis on delete_stemcell_spec.
Fixing build by stubbing out locks and not connecting to Redis on delete_stemcell_spec.

[#104951996](https://www.pivotaltracker.com/story/show/104951996)

Signed-off-by: Shatarupa Nandi <3efeaa499e3e1d586e0cf648346ba222fe46816b@pivotal.io>

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh