MFC 1.99: clear/reclaim challenge text when switching auth mode and 	  operating as an ap
MFC 1.99: clear/reclaim challenge text when switching auth mode and
	  operating as an ap

Obtained from:	Atheros

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase