NsdServiceInfo: move test to tests/net

This patch also
  - adds a license plate to NsdServiceInfoTest
  - fixes some formatting and style issues
      package name
      uses of canonical junit asserts
  - update NsdServiceInfoTest to not use the deprecated AndroidTestCase

Bug: 62044295
Bug: 32561414
Test: $ runtest frameworks-net passes
Change-Id: Ie5ebb00172aef4eec19e6ecd2b41c4467901b93d