Merge "[NS01] Add NetworkScore"

core/java/android/net/NetworkScore.java

framework/src/android/net/ConnectivityManager.java

framework/src/android/net/IConnectivityManager.aidl

framework/src/android/net/NetworkAgent.java

.../com/android/connectivity/aidl/INetworkAgentRegistry.aidl

...ces/core/java/com/android/server/ConnectivityService.java

...ava/com/android/server/connectivity/NetworkAgentInfo.java

.../net/java/com/android/server/ConnectivityServiceTest.java

...va/com/android/server/connectivity/LingerMonitorTest.java

tests/net/java/com/android/server/connectivity/VpnTest.java