To help find the root cause of high authentication failure rate in enterprise network, add EAP method and authentication phase2 method in connection event metrics. Bug: 150237135 Test: manual Test: atest com.android.server.wifi Merged-In: I7f3268b2842783f99c0a43d8b4996d0a7dd46c6e Change-Id: Id4ac7947871785d16b81c0806986f54d64fdb0ce