[cinder] allow combination of api and volume

this allows cinder::api and cinder::volume to be applied to the same
node

Signed-off-by: Simon Peeters <peeters.simon@gmail.com>
[quantum] allow router and server on same node

Signed-off-by: Simon Peeters <peeters.simon@gmail.com>
horizon: fix selinux checking

Signed-off-by: Simon Peeters <peeters.simon@gmail.com>
fix ordering creation bridge device
Merge pull request #16 from SimonPe/master

Allow multiple roles on same node, fix selinux bug, fix ovs bug