Fix server startup when replication.config exists

The addition of the per-request RefControl cache broke push
replication as the PushOp "request" could not locate a Guice
binding for the cache.

Use the same trick we do with MergeOp to setup a per-operation
"request" scope for Guice.

Change-Id: I0cecbad4809493f43cb2fec3624b1a53e38fb48f
4 files changed