Fedora: Do not start the lvmetad service after Fedora 30

This deprecated service has been removed from lvm2 in Fedora 31:

https://src.fedoraproject.org/rpms/lvm2/c/0469456b352530d9f507f2515e674bfb03671f48

Change-Id: I06d572a72969c5e5e8e038caef19e358e4f97b2b
diff --git a/lib/lvm b/lib/lvm
index d9e78a0..92265f2 100644
--- a/lib/lvm
+++ b/lib/lvm
@@ -124,13 +124,15 @@
     local vg=$1
     local size=$2
 
-    # Start the lvmetad and tgtd services
-    if is_fedora || is_suse; then
+    # Start the lvmetad on f30 (dropped from f31) or SUSE
+    if [[ $DISTRO =~ f30 ]] || is_suse; then
         # services is not started by default
         start_service lvm2-lvmetad
-        if [ "$CINDER_ISCSI_HELPER" = "tgtadm" ]; then
-            start_service tgtd
-        fi
+    fi
+
+    # Start the tgtd service on Fedora and SUSE if tgtadm is used
+    if  is_fedora || is_suse  && [[ "$CINDER_ISCSI_HELPER" = "tgtadm" ]]; then
+        start_service tgtd
     fi
 
     # Start with a clean volume group