bless python versions newer than 2.6

Change-Id: Ic4bfb857586f1fd4aa9cfddf5984341a89b0cd4a
Signed-off-by: Li Li <lli5@nvidia.com>
Reviewed-on: http://git-master/r/347711
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Peter Zu <pzu@nvidia.com>
p2p: Display P2P peer MAC address if device name is empty.

Display MAC address of a P2P peer in an invitation prompt
message on receiving invitation request from the P2P peer
with empty device name.

Change-Id: Icabeb91d666437746eb5a733ec582849eb7295a5
CRs-Fixed: 506109