I've committed this fix to the git repo for OVN for bionic, however
there is no point in uploading it without another fix or point release
as its related to package upgrade.

** Changed in: openvswitch (Ubuntu Bionic)
     Assignee: (unassigned) => James Page (james-page)

** Description changed:

- When the openvswitch-switch package is upgraded, the various daemons get
- restarted multiple times (see maintainer script below):
+ [Impact]
+ OVS daemons are restarted multiple times on package upgrade resulting in a 
protracted period of network pause for OVS management network objects due to 
multiple restarts.
+ 
+ [Test Case]
+ Upgrade openvswitch-switch package/dpkg-reconfigure openvswitch-swithc
+ Examine systemd journal - ovsdb-server and ovs-vswitchd get restarted 
multiple times in quick session
+ 
+ [Regression Potential]
+ Low - Ubuntu has had this fix in packaging since Disco with no reported 
adverse effects.
+ 
+ [Original Bug Report]
+ When the openvswitch-switch package is upgraded, the various daemons get 
restarted multiple times (see maintainer script below):
  
  # Automatically added by dh_systemd_start/12ubuntu1
  if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = 
"abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
-     if [ -d /run/systemd/system ]; then
-         systemctl --system daemon-reload >/dev/null || true
-         if [ -n "$2" ]; then
-             _dh_action=restart
-         else
-             _dh_action=start
-         fi
-         deb-systemd-invoke $_dh_action 'ovs-vswitchd.service' 
'ovsdb-server.service' >/dev/null || true
-     fi
+     if [ -d /run/systemd/system ]; then
+         systemctl --system daemon-reload >/dev/null || true
+         if [ -n "$2" ]; then
+             _dh_action=restart
+         else
+             _dh_action=start
+         fi
+         deb-systemd-invoke $_dh_action 'ovs-vswitchd.service' 
'ovsdb-server.service' >/dev/null || true
+     fi
  fi
  # End automatically added section
  # Automatically added by dh_systemd_start/12ubuntu1
  if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = 
"abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
-     if [ -d /run/systemd/system ]; then
-         systemctl --system daemon-reload >/dev/null || true
-         if [ -n "$2" ]; then
-             deb-systemd-invoke try-restart 'ovs-vswitchd.service' 
'ovsdb-server.service' >/dev/null || true
-         fi
-     fi
+     if [ -d /run/systemd/system ]; then
+         systemctl --system daemon-reload >/dev/null || true
+         if [ -n "$2" ]; then
+             deb-systemd-invoke try-restart 'ovs-vswitchd.service' 
'ovsdb-server.service' >/dev/null || true
+         fi
+     fi
  fi
  # End automatically added section
  # Automatically added by dh_systemd_start/12ubuntu1
  if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = 
"abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
-     if [ -d /run/systemd/system ]; then
-         systemctl --system daemon-reload >/dev/null || true
-         if [ -n "$2" ]; then
-             deb-systemd-invoke try-restart 'ovs-vswitchd.service' 
'ovsdb-server.service' >/dev/null || true
-         fi
-     fi
+     if [ -d /run/systemd/system ]; then
+         systemctl --system daemon-reload >/dev/null || true
+         if [ -n "$2" ]; then
+             deb-systemd-invoke try-restart 'ovs-vswitchd.service' 
'ovsdb-server.service' >/dev/null || true
+         fi
+     fi
  fi
  # End automatically added section
  # Automatically added by dh_installinit/12ubuntu1
  if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = 
"abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
-     if [ -x "/etc/init.d/openvswitch-switch" ]; then
-         update-rc.d openvswitch-switch defaults >/dev/null
-         if [ -n "$2" ]; then
-             _dh_action=restart
-         else
-             _dh_action=start
-         fi
-         invoke-rc.d openvswitch-switch $_dh_action || exit 1
-     fi
+     if [ -x "/etc/init.d/openvswitch-switch" ]; then
+         update-rc.d openvswitch-switch defaults >/dev/null
+         if [ -n "$2" ]; then
+             _dh_action=restart
+         else
+             _dh_action=start
+         fi
+         invoke-rc.d openvswitch-switch $_dh_action || exit 1
+     fi
  fi
  # End automatically added section
  
- 
- This results in a extended period of network loss for OVS ports - really the 
only one that is required is the restart of openvswitch-switch (which covers 
the other two as depends anyway).
+ This results in a extended period of network loss for OVS ports - really
+ the only one that is required is the restart of openvswitch-switch
+ (which covers the other two as depends anyway).
  
  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: openvswitch-switch 2.11.0-0ubuntu1
  ProcVersionSignature: Ubuntu 5.0.0-8.9-generic 5.0.1
  Uname: Linux 5.0.0-8-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu25
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Apr  5 08:24:32 2019
  InstallationDate: Installed on 2018-10-18 (168 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
(20181017.3)
  SourcePackage: openvswitch
  UpgradeStatus: Upgraded to disco on 2019-03-17 (18 days ago)

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https://bugs.launchpad.net/bugs/1823295

Title:
  openvswitch-switch package upgrades restart daemons multiple times

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