rhel: Avoid logrotate error if /var/run/openvswitch does not exist

Avoid also errors if an ovs server didn't start correctly or it crashed without
deleting the pid file.

Reported-at: https://bugzilla.redhat.com/show_bug.cgi?id=1441524
Signed-off-by: Timothy Redaelli <tredaelli@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

rhel/etc_logrotate.d_openvswitch

@@ -12,8 +12,10 @@
     missingok
     postrotate
         # Tell Open vSwitch daemons to reopen their log files
-        for pidfile in `cd /var/run/openvswitch && echo *.pid`; do
-            ovs-appctl -t "${pidfile%%.pid}" vlog/reopen
-        done
+        if [ -d /var/run/openvswitch ]; then
+            for pidfile in `cd /var/run/openvswitch && echo *.pid`; do
+                ovs-appctl -t "${pidfile%%.pid}" vlog/reopen 2>/dev/null || :
+            done
+        fi
     endscript
 }