stomp: Server side heartbeat implementation

Bug-Url: https://bugzilla.redhat.com/1115044
Change-Id: I72e1af2e7ddf8d9b461163f0ef315677c1bb97d4
Signed-off-by: Saggi Mizrahi <smizrahi@redhat.com>
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>
Reviewed-on: http://gerrit.ovirt.org/30596
(cherry picked from commit 8e616115540291b201929be4588154892b579ff5)
Reviewed-on: http://gerrit.ovirt.org/30741
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>