Use local defined NetworkSpecifier to verify test

Test will be affected by logic modification from different
NetworkSpecifiers. Since this test tries to test the behavior
of NetworkRequest but not NetworkSpecifier, use local defined
NetworkSpecifier to test to prevent repeating noisy breaks.
Also update test for testing invariant.

Bug: 154451660
Test: atest CtsNetTestCasesLatestSdk:android.net.cts.NetworkRequestTest
Merged-In: I7e357c75a68244432231d59646ddf67c8d969c6d
Change-Id: I7e357c75a68244432231d59646ddf67c8d969c6d
1 file changed
tree: fe083b5cdd731a5203410b211f3ef62036ce7772
  1. tests/