rhel: Add 'SYSTEMD_NO_WRAP=yes' in ovs init script for SLES

The variable equivalent to RHEL's 'SYSTEMCTL_SKIP_REDIRECT=yes' on SLES
12 is 'SYSTEMD_NO_WRAP=yes'

VMware-BZ: #2245358
Reviewed-by: Markos Chandras <mchandras@suse.de>
CC: Markos Chandras <mchandras@suse.de>
CC: Ansis Atteka <aatteka@ovn.org>
CC: Ben Pfaff <blp@ovn.org>
Signed-off-by: Martin Xu <martinxu9.ovs@gmail.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

rhel/etc_init.d_openvswitch

@@ -28,6 +28,7 @@
 ### END INIT INFO
 
 SYSTEMCTL_SKIP_REDIRECT=yes
+SYSTEMD_NO_WRAP=yes
 
 . /usr/share/openvswitch/scripts/ovs-lib || exit 1
 test -e /etc/sysconfig/openvswitch && . /etc/sysconfig/openvswitch