Download default image when using VIRT_DRIVER=fake

Change f119121 removed
the default image to download which meant if you were using
the fake virt driver, no image would get downloaded and
tempest setup would fail.

This adds it back in but doesn't use a wildcard.

The default image is the same as before, but uses the
variables that are also used for the default libvirt image
case.

Change-Id: I80eddd0d3a99572ed494b5cd36fed8ceb4d05d77
Closes-Bug: #1720003

Author: mriedem

stackrc

@@ -701,6 +701,11 @@ if [[ "$DOWNLOAD_DEFAULT_IMAGES" == "True" ]]; then
             DEFAULT_IMAGE_FILE_NAME=${DEFAULT_IMAGE_NAME:-cirros-0.3.5-x86_64-disk.vhd.tgz}
             IMAGE_URLS+="http://ca.downloads.xensource.com/OpenStack/cirros-0.3.5-x86_64-disk.vhd.tgz"
             IMAGE_URLS+=",http://download.cirros-cloud.net/${CIRROS_VERSION}/cirros-${CIRROS_VERSION}-x86_64-uec.tar.gz";;
+        fake)
+            # Use the same as the default for libvirt
+            DEFAULT_IMAGE_NAME=${DEFAULT_IMAGE_NAME:-cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-disk}
+            DEFAULT_IMAGE_FILE_NAME=${DEFAULT_IMAGE_FILE_NAME:-cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-disk.img}
+            IMAGE_URLS+="http://download.cirros-cloud.net/${CIRROS_VERSION}/${DEFAULT_IMAGE_FILE_NAME}";;
     esac
     DOWNLOAD_DEFAULT_IMAGES=False
 fi