[Testing] Use AndroidJUnit4 instead in MobileNetworkUtilsTest

1. Use AndroidJunit4 instead of RobolectricTestRunner
2. Use ApplicationProvider instead of RuntimeEnvironment to get context
3. Change the Copy Right
4. Create the real object for PhoneAccountHandle and ComponentName

Bug: 164989754
Test: atest -c MobileNetworkUtilsTest
Change-Id: I1778832b0602062adb24928343c0c1d0e525942d
Merged-In: I1778832b0602062adb24928343c0c1d0e525942d
1 file changed