Changed BrokerLink log level to prevent log flooding

- vdsm imports the BrokerLink lib with ovirt_hosted_engine_ha,
  unfortunatelly it's logger generates a lot of debug output
  in the default configuration, so this patch sets the level
  of the whole ovirt_hosted_engine_ha package to ERROR
  to limit the amount of the logs

- NOTE: this patch needs some changes in the ovirt_hosted_engine_ha
  logging, without these changes it does not have any
  effect

Depends-On: I40fb7aca813800dd445e858406034736817cac9c
Change-Id: Icc470175d785d216fe75837e5cb3572adf340fe6
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1040884
Signed-off-by: Jiri Moskovcak <jmoskovc@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/21947
Reviewed-by: Martin Sivák <msivak@redhat.com>
Reviewed-by: Doron Fediuck <dfediuck@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>