DO NOT MERGE: Fixed NetworkStatsServiceTest and converted it to JUnit4.
Most tests were failing because due to a null NetworkCapabilities.
Example:
1) testNetworkStatsWifi(com.android.server.net.NetworkStatsServiceTest)
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.net.NetworkCapabilities.hasCapability(int)' on a null object reference
at
com.android.server.net.NetworkStatsService.updateIfacesLocked(NetworkStatsService.java:983)
BUG:
30839080
(cherry picked from commit
574f370c6da52eeffe747248d68ef044617c7bcf)
(cherry picked from commit
77cba4bdf6de8aec02efe0da7e84f17603912b21)
Change-Id: I6eee96178ade6adfc1406e06d5376206ca2420e5