fix for screenshot animation glitch in portrait

edits by Stefano Semeraro aka Suxsem.

Change-Id: I7a03a24c5b1bfdfe616f940b2bd7be42091f45a6
Clear the scan list when an empty list is received

When the framework receives an empty scan list from supplicant, it does
not clear the local list. So the UI will continue to show the previous
scan list even when there are no APs around. So clear the local list,
when an empty list is received.

CRs-Fixed: 552212
Change-Id: I8715bc31ce0df7bd54c96fcf7d7b73592429f12a
wlan: Error handling on PNO failure due to active P2P session.

If set PNO fails due to concurrent active p2p sessions,
handle the error condition in framework and issue a
regular scan for every framework background scan interval
until set PNO is either success or disabled.

Change-Id: Ia4e8d9aef9ed24e534cb57cea7c8ba7a7ffc509e
CRs-Fixed: 568458
Close sockets on wpa_supplicant termination.

Framework does not close the sockets on supplicant
termination, leading to leakage of file descriptors.

Thus close the socket on supplicant termination.

Change-Id: I50aefc6d60b3794288564f403a42258442e224df
CRs-Fixed: 576276