core: Fix empty quota events tab

The Events sub tab under the quota always remained empty.

The reasons for that were:
 a. The quota id was never saved in the audit_log table in the DB
 b. The search query for quota events was parsed wrong

Added the quota ID and name to the AuditLogableBase.
Added correct parsing for the search to recognize 'quota' as an object.

Change-Id: I207db27df01705660dc33874cd0e222028c0ff63
Bug-Url: https://bugzilla.redhat.com/920226
Signed-off-by: Ofri Masad <omasad@redhat.com>