Hide lock_prefix argument using synchronized_with_prefix()

The lockfile module has a new convenience API which sets the lockfile prefix.
Using this API, the prefix is not required everytime synchronized is used.

Change-Id: Iac1cfcc83b59108164de924d20127c1cf4dd7dcd
Merge "Hide lock_prefix argument using synchronized_with_prefix()"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp