rhel: fix logrotate user config option

If rpm is built with libcapng (default), /etc/logrotate.d/ovn
config file user is SEDed in postinstall section with 'ovn ovn'.

If one run logrotate, next error occurs:
```
[root@host ~]# logrotate /etc/logrotate.d/ovn
error: /etc/logrotate.d/ovn:9 unknown user 'ovn'
error: found error in /var/log/ovn/*.log , skipping
```

Replace 'ovn' user with 'openvswitch' to fix the issue.

Signed-off-by: Vladislav Odintsov <odivlad@gmail.com>
Acked-by: Mark Michelson <mmichels@redhat.com>
Signed-off-by: Numan Siddique <numans@ovn.org>
(cherry picked from commit e8800dd)

rhel/ovn-fedora.spec.in

@@ -323,7 +323,7 @@ ln -sf ovn_detrace.py %{_bindir}/ovn-detrace
 %if %{with libcapng}
 if [ $1 -eq 1 ]; then
     sed -i 's:^#OVN_USER_ID=:OVN_USER_ID=:' %{_sysconfdir}/sysconfig/ovn
-    sed -i 's:\(.*su\).*:\1 ovn ovn:' %{_sysconfdir}/logrotate.d/ovn
+    sed -i 's:\(.*su\).*:\1 openvswitch openvswitch:' %{_sysconfdir}/logrotate.d/ovn
 fi
 %endif