Skip devstack/exercises by default

In order to avoid maintaining test cases in two location,
the devstack/exercises should be disabled when tempest is enabled.

The exercises is preserved for grande and stable branch jobs.

A smaller/faster 'smoke' test case set can be selected from the tempest
test cases if it is needed.

Fixing bug #1023131

Change-Id: Icac3998fb2c18274d909afcff8708af149d68197

devstack-vm-gate-wrap.sh

@@ -370,8 +370,8 @@ fi
 # Set to 1 to run the Tempest test suite
 export DEVSTACK_GATE_TEMPEST=${DEVSTACK_GATE_TEMPEST:-0}
 
-# Set to 0 to skip the devstack exercises
-export DEVSTACK_GATE_EXERCISES=${DEVSTACK_GATE_EXERCISES:-1}
+# Set to 1 to run the devstack exercises
+export DEVSTACK_GATE_EXERCISES=${DEVSTACK_GATE_EXERCISES:-0}
 
 # Set to 1 to run postgresql instead of mysql
 export DEVSTACK_GATE_POSTGRES=${DEVSTACK_GATE_POSTGRES:-0}
@@ -403,6 +403,7 @@ export DEVSTACK_GATE_CELLS=${DEVSTACK_GATE_CELLS:-0}
 export DEVSTACK_GATE_GRENADE=${DEVSTACK_GATE_GRENADE:-0}
 
 if [ "$DEVSTACK_GATE_GRENADE" -eq "1" ]; then
+    export DEVSTACK_GATE_EXERCISES=1
     if [ "$ZUUL_BRANCH" == "stable/grizzly" ]; then
 # Set to 1 to run cinder instead of nova volume
 # Only applicable to stable/folsom branch
@@ -412,15 +413,17 @@ if [ "$DEVSTACK_GATE_GRENADE" -eq "1" ]; then
         export GRENADE_OLD_BRANCH="stable/grizzly"
         export DEVSTACK_GATE_CINDER=1
         export DEVSTACK_GATE_TEMPEST=1
-        export DEVSTACK_GATE_EXERCISES=1
     else # master
         export GRENADE_OLD_BRANCH="stable/grizzly"
         export DEVSTACK_GATE_CINDER=1
         export DEVSTACK_GATE_TEMPEST=1
-        export DEVSTACK_GATE_EXERCISES=1
     fi
 fi
 
+if [ "$ZUUL_BRANCH" == "stable/grizzly" -o "$ZUUL_BRANCH" == "stable/folsom"]; then
+    export DEVSTACK_GATE_EXERCISES=1
+fi
+
 # Set the virtualization driver to: libvirt, openvz
 export DEVSTACK_GATE_VIRT_DRIVER=${DEVSTACK_GATE_VIRT_DRIVER:-libvirt}