Change type of rabbit_durable_queues to boolean.
Change type of rabbit_durable_queues to boolean.

Fixes bug 1056465

The rabbit_durable_queues config option should be of type boolean
instead of string, otherwise it does not have the expected effect on
the durability of rabbitmq exchanges and queues.

Change-Id: I9b3dc7d763b109c1bf10f78ebe725d71ed10791a

cloudbau/glance,stevelle/glance,stevelle/glance,sigmavirus24/glance,JioCloud/glance,rickerc/glance_audit,SUSE-Cloud/glance,paramite/glance,ozamiatin/glance,vuntz/glance,openstack/glance,kfwang/Glance-OVA-OVF,ozamiatin/glance,jumpstarter-io/glance,rajalokan/glance,citrix-openstack-build/glance,kfwang/Glance-OVA-OVF,jumpstarter-io/glance,paramite/glance,tanglei528/glance,dims/glance,scripnichenko/glance,openstack/glance,takeshineshiro/glance,ntt-sic/glance,rickerc/glance_audit,scripnichenko/glance,klmitch/glance,darren-wang/gl,sigmavirus24/glance,akash1808/glance,klmitch/glance,citrix-openstack-build/glance,wkoathp/glance,SUSE-Cloud/glance,openstack/glance,darren-wang/gl,ntt-sic/glance,dims/glance,cloudbau/glance,redhat-openstack/glance,redhat-openstack/glance,JioCloud/glance,takeshineshiro/glance,saeki-masaki/glance,vuntz/glance,tanglei528/glance,saeki-masaki/glance,akash1808/glance,wkoathp/glance,rajalokan/glance