Fix sorting timestamp column in alarm history table
Fix sorting timestamp column in alarm history table

Change-Id: Ib713e5142e92a0a8226631a16a3dc69910f94680

openstack/monasca-ui,openstack/monasca-ui,stackforge/monasca-ui,stackforge/monasca-ui,openstack/monasca-ui,stackforge/monasca-ui,stackforge/monasca-ui,openstack/monasca-ui