Merge pull request #131 from vuntz/bnc#886382

Use correct attribute to check for HA for nova controller
Drop flat networking mode

It never worked, and is not really useful in real world anyway.

https://bugzilla.novell.com/show_bug.cgi?id=888359
Merge pull request #134 from vuntz/drop-flat

Drop flat networking mode
Hide neutron-l3 role when vmware plugin
NSX integration fixes