rhel: Use PIDFile on forking systemd service files

Currently, PIDFile is not used in systemd service files with
Type=forking. This means sometimes systemd fails to restart a daemon
that is killed (with SIGKILL) or that is crashed.

This commit adds PIDFile to all systemd service file with Type=forking
in order to always have the correct PID to monitor.

Reported-at: https://bugzilla.redhat.com/1653717
Reported-by: Candido Campos <ccamposr@redhat.com>
Acked-by: Flavio Leitner <fbl@sysclose.org>
Signed-off-by: Timothy Redaelli <tredaelli@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

rhel/usr_lib_systemd_system_openvswitch-ipsec.service

@@ -5,6 +5,7 @@ After=openvswitch.service
 
 [Service]
 Type=forking
+PIDFile=/var/run/openvswitch/ovs-monitor-ipsec.pid
 ExecStart=/usr/share/openvswitch/scripts/ovs-ctl \
                     --ike-daemon=libreswan start-ovs-ipsec
 ExecStop=/usr/share/openvswitch/scripts/ovs-ctl stop-ovs-ipsec

rhel/usr_lib_systemd_system_ovn-controller.service

@@ -21,6 +21,7 @@ After=openvswitch.service
 
 [Service]
 Type=forking
+PIDFile=/var/run/openvswitch/ovn-controller.pid
 Restart=on-failure
 EnvironmentFile=-/etc/sysconfig/ovn-controller
 ExecStart=/usr/share/openvswitch/scripts/ovn-ctl --no-monitor \

rhel/usr_lib_systemd_system_ovs-vswitchd.service.in

@@ -9,6 +9,7 @@ PartOf=openvswitch.service
 
 [Service]
 Type=forking
+PIDFile=/var/run/openvswitch/ovs-vswitchd.pid
 Restart=on-failure
 Environment=XDG_RUNTIME_DIR=/var/run/openvswitch
 EnvironmentFile=/etc/openvswitch/default.conf

rhel/usr_lib_systemd_system_ovsdb-server.service

@@ -7,6 +7,7 @@ PartOf=openvswitch.service
 
 [Service]
 Type=forking
+PIDFile=/var/run/openvswitch/ovsdb-server.pid
 Restart=on-failure
 EnvironmentFile=/etc/openvswitch/default.conf
 EnvironmentFile=-/etc/sysconfig/openvswitch