WIP
Better code for working out provider type
Merge branch 'master' of github.com:juju/juju into network-interfaces
Restore copyright header
Minor tweak
Test fixes
Test config files not written when specified
Test improvement
Minor refactoring
Adding periods to comments
Use NewSafeNetworker
Switch to only writing network config for maas (hack)
Minor tweaks
Add lp bug reference
Merge pull request #477 from voidspace/network-interfaces

Do not mess with network interfaces except for maas

Fixes bug 1349635. 

Don't write or remove network config files except for with the maas provider.