tests: Accept "user@example.com" as user identity similarly to "user"

This is needed to allow updated Interworking behavior that adds the
realm to the EAP-Response/Identity value.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

tests/hwsim/auth_serv/eap_user.conf

@@ -110,6 +110,7 @@ radius_accept_attr=89:s:macacl-cui-test
 "utf8-user-hash"	TTLS-MSCHAPV2	hash:bd5844fad2489992da7fe8c5a01559cf	[2]
 
 "user"	MSCHAPV2,MD5,GTC	"password"	[2]
+"user@example.com"	MSCHAPV2,MD5,GTC	"password"	[2]
 "user2"	MSCHAPV2,MD5,GTC	"password"	[2]
 "DOMAIN\user3"	MSCHAPV2	"password"	[2]
 "user-no-passwd"	MSCHAPV2,MD5,GTC	[2]