Indicate WPA_EVENT_TERMINATING event on primary interface.

Internal fabricated WPA_EVENT_TERMINATING events to restart
supplicant should be sent on primary interface.

Change-Id: I2d018e0707819614d9b092c6f3a812f04b5446ca
Merge "Indicate WPA_EVENT_TERMINATING event on primary interface."
auto-merger: merge in from aosp/master