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)
Change-Id: Ie09b2f43cf6ec745e404d5ec98bd0b072d211ea3