Trivial fixes from review of os-test-images

This fixes some trivial things from the review where this support was
added:

https://review.opendev.org/c/openstack/devstack/+/925425

Change-Id: I990a3816f425a1b4c8680ec43d698e32eea2238b
diff --git a/lib/tempest b/lib/tempest
index 24c8271..310db2d 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -105,10 +105,6 @@
 TEMPEST_FLAVOR_RAM=${TEMPEST_FLAVOR_RAM:-192}
 TEMPEST_FLAVOR_ALT_RAM=${TEMPEST_FLAVOR_ALT_RAM:-256}
 
-OSTESTIMAGES_REPO=${OSTESTIMAGES_REPO:-${GIT_BASE}/openstack/os-test-images.git}
-OSTESTIMAGES_BRANCH=${OSTESTIMAGES_BRANCH:-$BRANCHLESS_TARGET_BRANCH}
-OSTESTIMAGES_DIR=${DEST}/os-test-images
-
 # Functions
 # ---------
 
@@ -369,7 +365,7 @@
         iniset $TEMPEST_CONFIG image images_manifest_file ${OSTESTIMAGES_DIR}/images/manifest.yaml
         local image_conversion
         image_conversion=$(iniget $GLANCE_IMAGE_IMPORT_CONF image_conversion output_format)
-        if [[ "$image_conversion" ]]; then
+        if [[ -n "$image_conversion" ]]; then
             iniset $TEMPEST_CONFIG image-feature-enabled image_conversion True
         fi
     fi
diff --git a/stackrc b/stackrc
index 0492c73..0b3e1c6 100644
--- a/stackrc
+++ b/stackrc
@@ -304,6 +304,9 @@
 TEMPEST_BRANCH=${TEMPEST_BRANCH:-$BRANCHLESS_TARGET_BRANCH}
 TEMPEST_VENV_UPPER_CONSTRAINTS=${TEMPEST_VENV_UPPER_CONSTRAINTS:-master}
 
+OSTESTIMAGES_REPO=${OSTESTIMAGES_REPO:-${GIT_BASE}/openstack/os-test-images.git}
+OSTESTIMAGES_BRANCH=${OSTESTIMAGES_BRANCH:-$BRANCHLESS_TARGET_BRANCH}
+OSTESTIMAGES_DIR=${DEST}/os-test-images
 
 ##############
 #