Cleaning EthernetNetworkFactoryTest Unprovisioned

Clearing up the EthernetNetworkFactoryTest unprovisioned helped method a
bit to accomplish the same thing with fewer lines of code and not rely
on the ref count to stop an interface.

Bug: 197548738
Test: atest EthernetServiceTests
Change-Id: I0fb80b569b6f59ee82fbd528ffad044278ab80c8
1 file changed
tree: 03dd1daaabc12bf66b6edcb5e3046299b79689f2
  1. service-t/
  2. tests/