Merge pull request #260 from mjura/release/roxy/vmware-support

VMware vCenter support for roxy branch
Remove support for nova-network
Remove unused variable
Add migration script for nova-network removal
Add role constraints for xen role
Merge pull request #294 from vuntz/fix-xen

Add role constraints for xen role
Merge pull request #289 from vuntz/no-nova-network

Kill nova-network support
Completely drop network recipe

Everything it does should really be done by neutron.
Improve some strings
webui: Reorder live migration settings
Merge pull request #295 from vuntz/no-network-recipe

Completely drop network recipe
Merge pull request #296 from vuntz/tweak-ui

Trivial change, merging
Drop unused cookbook_file for nova-common

It was never run, so it's not really needed.
Merge pull request #299 from vuntz/no-nova-common

Drop unused cookbook_file for nova-common
Update migration script