packaging: Reverting the execution of encodingvalidator

This patch removes execution of the encodingvalidator
utility on upgrade and restores running validators with
SERVER_ADMIN permissions.

Change-Id: Iabb320fd8d4df8b2a3f943a98dd3309469c730b7
Bug-Url: https://bugzilla.redhat.com/893459
Signed-off-by: Alex Lourie <alourie@redhat.com>