Merge changes I90340ea2,Ib1f49af3,I86b0efdb,I7e7f3768 into pi-dev

* changes:
  WifiNative: Ensure we have a consistent death handling mechanism
  WificondControl: Always check for existing ifaces
  SupplicantP2pIfaceHal: Always check for existing ifaces
  SupplicantStaIfaceHal: Always check for existing ifaces