tree-wide: drop f31 support

We no longer release into F31, and the right specfile was anyway not
being tested.

This allows us to remove a workaround that updates the VMs during
deploy, and other fedora-31 specific hacks.

test/cmd/api.sh

@@ -65,9 +65,6 @@ case $(set +x; . /etc/os-release; echo "$ID-$VERSION_ID") in
   "rhel-8.2" | "rhel-8.3")
     DISTRO="rhel-8"
   ;;
-  "fedora-31")
-    DISTRO="fedora-31"
-  ;;
   "fedora-32")
     DISTRO="fedora-32"
   ;;

test/cmd/ostree.sh

@@ -9,9 +9,7 @@ ARCH=$(uname -m)
 
 # Set os-variant and boot location used by virt-install.
 case "${ID}-${VERSION_ID}" in
-    # Bypass ostree test on fedora-31 and rhel 8.2
-    "fedora-31")
-        exit 0;;
+    # Bypass ostree test on rhel 8.2
     "rhel-8.2")
         exit 0;;
     "fedora-32")