flow/manager: Fix conncache reservedfind to respect when cache is closed.
flow/manager: Fix conncache reservedfind to respect when cache is closed.

Change-Id: I1f8d46cdf691aae499485857dce8e71537c71614

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref