Description of problem:

Activating event notifification, along with trying to add/delete domain
by rhevm-manage-domains cause DB related commands to fail on database access.

Version-Release number of selected component (if applicable):
SI24.5

How reproducible:
always (tried on 2 clean install setups)

Steps to Reproduce:
1. Define the /etc/ovirt-engine/notifier/notifier.conf for sending notifications
(My conf attached as example)
2. Activate engine-notifierd service. 
(/etc/rc.d/init.d/engine-notifierd start)
3. Attach event notification to a user 
(I added a user from AD, attached to it event notification for ovirt-engine stop)
4. rhevm-manage-domains delete or add domain fail to access DB.
(I run: 
rhevm-manage-domains  -action=delete -addPermissions -domain=qa.lab.tlv.redhat.com -user=dafna  -interactive -provider=activeDirectory
Failure while connecting to database. Details: FATAL: connection limit exceeded for non-superusers)
  
Actual results:
Commands related to database DB connection fail on limit exceeded error:
Examples:
--------
1.
rhevm-manage-domains  -action=delete -addPermissions -domain=qa.lab.tlv.redhat.com -user=dafna  -interactive -provider=activeDirectory

Failure while connecting to database. Details: FATAL: connection limit exceeded for non-superusers

2.
rhevm-config -l
Connection to the Database failed. Please check that the hostname and port number are correct and that the Database service is up and running.

Expected results:
Event notification should not interfere DB access.

Additional info:
Stop engine-notifierd release the DB.