Remove references to XenAPI driver

The XenAPI driver was removed during the Victoria release [1], while the
libvirt+xen driver has been removed in the Wallaby release [2]. Remove
references to Xen from DevStack since its all a no-op now.

[1] I42b302afbb1cfede7a0f7b16485a596cd70baf17
[2] I73305e82da5d8da548961b801a8e75fb0e8c4cf1

Change-Id: If7055feb88391f496a5e5e4c72008bf0050c5356
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>
diff --git a/lib/tempest b/lib/tempest
index 8a5b785..9ccd19b 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -347,9 +347,6 @@
     if [[ ! -z "$TEMPEST_HTTP_IMAGE" ]]; then
         iniset $TEMPEST_CONFIG image http_image $TEMPEST_HTTP_IMAGE
     fi
-    if [ "$VIRT_DRIVER" = "xenserver" ]; then
-        iniset $TEMPEST_CONFIG image disk_formats "ami,ari,aki,vhd,raw,iso"
-    fi
     iniset $TEMPEST_CONFIG image-feature-enabled import_image $GLANCE_USE_IMPORT_WORKFLOW
     iniset $TEMPEST_CONFIG image-feature-enabled os_glance_reserved True
     # Compute
@@ -425,15 +422,8 @@
     iniset $TEMPEST_CONFIG network-feature-enabled port_security $NEUTRON_PORT_SECURITY
 
     # Scenario
-    if [ "$VIRT_DRIVER" = "xenserver" ]; then
-        SCENARIO_IMAGE_DIR=${SCENARIO_IMAGE_DIR:-$FILES}
-        SCENARIO_IMAGE_FILE="cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-disk.vhd.tgz"
-        iniset $TEMPEST_CONFIG scenario img_disk_format vhd
-        iniset $TEMPEST_CONFIG scenario img_container_format ovf
-    else
-        SCENARIO_IMAGE_DIR=${SCENARIO_IMAGE_DIR:-$FILES}
-        SCENARIO_IMAGE_FILE=$DEFAULT_IMAGE_FILE_NAME
-    fi
+    SCENARIO_IMAGE_DIR=${SCENARIO_IMAGE_DIR:-$FILES}
+    SCENARIO_IMAGE_FILE=$DEFAULT_IMAGE_FILE_NAME
     iniset $TEMPEST_CONFIG scenario img_file $SCENARIO_IMAGE_DIR/$SCENARIO_IMAGE_FILE
 
     # If using provider networking, use the physical network for validation rather than private