Some wireless devices don't support Ad-Hoc mode. Expose this fact in
the wireless capabilities so that clients can disable the hot-spot
option if neither CAP_ADHOC nor CAP_AP is available.
https://bugzilla.gnome.org/show_bug.cgi?id=692869
This commit implements MAC cloning feature in NetworkManager. To support that,
'PermHwAddress' property is added into *.Device.Wired and *.Device.Wireless
interfaces. The permanent MAC address is obtained when creating the device, and
is used for 'locking' connections to the device. If a cloned MAC is specified
in connection to be activated, the MAC is set to the interface in stage1. While
disconecting, the permanent MAC is set back to the interface.
