Properly detects NetworkManager on guest as well as devices controlled
by NetworkManager. Provides configuration option to enable/disbale
NetworkManager control on devices.
As described in /etc/sysconfig/network/ifcfg.template
Static template was already using the right one, but the dhcp configuration seems
to be copied from a Fedora/Redhat template.
This fixes the issue that the interface does not come up after reboot.
Zachary Flower
Chris Roberts
Simon Detheridge
Seth Vargo
Ryan Heffernan
Duncan Mac-Vicar P
Mitchell Hashimoto