Add support for all nova-manage commands

[plribeiro3000]

trafficstars

There is no support for the "nova-manage network create" commands in the fog library.

Nova-manage has been deprecated as of Folsom (https://wiki.openstack.org/wiki/NovaManage) but it has not been removed from the project.

Original issue opened by @kaseyalusi at fog/fog#3536

[plribeiro3000]

cc/ @kaseyalusi @TerryHowe @geemus