base

Move forward lock utilities to PackageHelper

The forward lock utilities will need to be called from
DefaultContainerService for ASEC packages in the future. Move them to
PackageHelper to aid in the transition.

Also move the public resource copying to the FileInstallArgs step which
makes a little bit more sense.

Change-Id: I3a62ac817719db3ee1c89c106a551dcbe9c44744