CTS tests for setOemNetworkPreference

CTS tests to validate the setOemNetworkPreference API on
ConnectivityManager. Additionally, a small bit of cleanup for
assumptions around the Wi-Fi feature.

Bug: 176496580
Bug: 176494815
Test: atest CtsNetTestCases:
android.net.cts.ConnectivityManagerTest#
testSetOemNetworkPreferenceForTestPref --iterations
atest CtsNetTestCases:
android.net.cts.ConnectivityManagerTest#
testSetOemNetworkPreferenceForTestOnlyPref --iterations

Original-Change: https://android-review.googlesource.com/1665079
Merged-in: Ia3e4b336123b60f6df1582aca2979129112afedc
Change-Id: Ia3e4b336123b60f6df1582aca2979129112afedc
1 file changed