Set qcow image file location with right cirros version

This commit ensures we also set the qcow image location in the
tempest config when we update qcow version. The tempest config has
a default value for img_file (which is incorrect) but before we can
remove the defaults in tempest we need to ensure devstack is using
it properly first. The only reason the tests weren't failing here is
because tempest falls back to using uec images (which devstack was
correctly setting config for) if qcow isn't found. The img_dir was
also hardcoded assuming a uec image, however if qcow is intended to be
used you'll need to be able to override that, which is added as
part of this commit.

Change-Id: I05af346b3c9be9560dc8846dd1f437cfbb2d5005

Author: mtreinish

lib/tempest

@@ -401,10 +401,12 @@ function configure_tempest {
     fi
 
     # Scenario
-    iniset $TEMPEST_CONFIG scenario img_dir "$FILES/images/cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-uec"
+    SCENARIO_IMAGE_DIR=${SCENARIO_IMAGE_DIR:-$FILES/images/cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-uec}
+    iniset $TEMPEST_CONFIG scenario img_dir $SCENARIO_IMAGE_DIR
     iniset $TEMPEST_CONFIG scenario ami_img_file "cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-blank.img"
     iniset $TEMPEST_CONFIG scenario ari_img_file "cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-initrd"
     iniset $TEMPEST_CONFIG scenario aki_img_file "cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-vmlinuz"
+    iniset $TEMPEST_CONFIG scenario img_file "cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-disk.img"
 
     # Large Ops Number
     iniset $TEMPEST_CONFIG scenario large_ops_number ${TEMPEST_LARGE_OPS_NUMBER:-0}