Turns out (afaics) there are no libdbus threading issues in what we've
found so far.  Rather,

libnih needs to be built with --enable-threading, otherwise it -
especially the error handling - is not thread-safe.

lxcfs needed a few tweaks to become thread-safe when built against
libnih

If current tests pan out (I have candidate patches in ppa:serge-
hallyn/lxd) then one last update should be to stop mutexing the use of
cgmanager in lxc (making the dbus connection per-thread as I did in
lxcfs)

** Changed in: cgmanager (Ubuntu)
       Status: Confirmed => Fix Released

** Changed in: dbus (Ubuntu)
       Status: New => Invalid

** Changed in: libnih (Ubuntu)
       Status: New => Confirmed

** Also affects: lxcfs (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1294200

Title:
  test linked against nih-dbus-tool-generated libraryis not thread-safe

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