Add Bluetooth NAP tethering support to Plasma NM. I changed the patch to

make it fit the connection editor in kcm module and added the IpV4Widget
for DUN connections so that user can change his/her DNS list.  Thanks
Rajeesh K Nambiar for this patch.

REVIEW: 101266
BUG: 209624
(cherry picked from commit 6238b858)