Bug fixes:
+• Avoid a dbus-daemon crash if re-creating a connection's policy fails.
+ If it isn't possible to re-create its policy (for example if it belongs
+ to a user account that has been deleted or if the Name Service Switch is
+ broken, on a system not supporting SO_PEERGROUPS), we now log a warning,
+ continue to use its current policy, and continue to reload other
+ connections' policies. (dbus#343; Peter Benie, Simon McVittie)
+
+• If getting the groups from a user ID fails, report the error correctly,
+ instead of logging "(null)" (dbus#343, Simon McVittie)
+
• Return the primary group ID in GetConnectionCredentials()' UnixGroupIDs
field for processes with a valid-but-empty supplementary group list
(dbus!422, cptpcrd)