Identify apps by Smack label instead of appName in NSMountLogic

Identify apps by Smack label instead of appName in NSMountLogic

NSMountLogic and Worker code used to take appName as application identifier
and then needed to translate it to Smack label. It was very awkward, because
such conversion needs access to PrivilegeDB in order to check hybrid status.

Now Smack label is being passed to that code right away, eliminating the
need for fetching Smack label.

Change-Id: I62c137ad08a5d7d271aa8d6adcb25e8bb56bdfe1
Signed-off-by: Rafal Krypa <r.krypa@samsung.com>