Add an openSUSE Tumbleweed devstack non-voting check job

This adds the necessary fixes to pass a devstack run
on openSUSE Tumbleweed. Also removes opensuse 42.2 as it
is EOL for some time already and no longer actively tested
in the OpenStack infra.

Depends-On: I1b68c08c07cf6653ea58506f738cbe0054b38f3a
Change-Id: I2894482deef063fd02b0818c695a2ddbf6767039
diff --git a/lib/rpc_backend b/lib/rpc_backend
index 44d0717..1c7c82f 100644
--- a/lib/rpc_backend
+++ b/lib/rpc_backend
@@ -52,7 +52,20 @@
     if is_service_enabled rabbit; then
         # Install rabbitmq-server
         install_package rabbitmq-server
-        if is_fedora; then
+        if is_suse; then
+            install_package rabbitmq-server-plugins
+            # the default systemd socket activation only listens on the loopback interface
+            # which causes rabbitmq to try to start its own epmd
+            sudo mkdir -p /etc/systemd/system/epmd.socket.d
+            cat <<EOF | sudo tee /etc/systemd/system/epmd.socket.d/ports.conf >/dev/null
+[Socket]
+ListenStream=
+ListenStream=[::]:4369
+EOF
+            sudo systemctl daemon-reload
+            sudo systemctl restart epmd.socket epmd.service
+        fi
+        if is_fedora || is_suse; then
             sudo systemctl enable rabbitmq-server
         fi
     fi