Spurious warnings from NetworkManager

[Jonathan Gazeley]

For a little while now my puppet has been printing the same warning on
every run. I ignored it for ages, but yesaterday since an upgrade to
MCollective it now emails me with the warning on every run, so I've
decided to fix it.

This is the warning:

** (process:24410): WARNING **: nm_client_get_devices: error getting
devices: The name org.freedesktop.NetworkManager was not provided by any
.service files

A quick Google search doesn't shed much light. Anyone got any suggestions?

Thanks,
Jonathan