Allow ceph backend for nova/cinder/glance

Add a DEVSTACK_GATE_CEPH var that allows a job to specify that it
wants ceph to be used.  When enabled, ceph is used as the backend for
nova, glance, and cinder.

Co-authored-by: Russell Bryant <rbryant@redhat.com>
Change-Id: I27845a8e60ce1a5099152f73f46c451662a6c50b

devstack-vm-gate.sh

@@ -40,6 +40,10 @@ function setup_localrc() {
         MY_ENABLED_SERVICES+=,$ENABLED_SERVICES
     fi
 
+    if [[ "$DEVSTACK_GATE_CEPH" == "1" ]]; then
+        echo "CINDER_ENABLED_BACKENDS=ceph:ceph" >>localrc
+    fi
+
     # the exercises we *don't* want to test on for devstack
     SKIP_EXERCISES=boot_from_volume,bundle,client-env,euca
 

features.yaml

@@ -33,6 +33,8 @@ config:
     features: [qpid]
   zeromq:
     features: [zeromq]
+  ceph:
+    features: [ceph]
 
 branches:
   # The value of ""default" is the name of the "trunk" branch
@@ -132,3 +134,7 @@ features:
     base:
       services: [qpid]
       rm-services: [rabbit]
+
+  ceph:
+    base:
+      services: [ceph]