record join attempts

Change-Id: I82ef09ec46d7ac7cc8bbe2939873a5f966ee0df7

 On branch scorer-logs
 Changes to be committed:
	modified:   java/android/net/wifi/WifiConnectionStatistics.java

 On branch scorer-logs
 Changes to be committed:
	modified:   java/android/net/wifi/WifiConnectionStatistics.java
1 file changed