Rename StringNetworkSpecifier to Ethernet

The new specifier represents ethernet interfaces more
specifically and is part of the public API.

Bug: 179329291
Test: atest CtsNetTestCases
Merged-In: I6cba1709b3007a22d95849a1281237c77e1464a4
Change-Id: I6cba1709b3007a22d95849a1281237c77e1464a4
1 file changed
tree: 61371d802c6cbe8aea7c327e4185e0970f3c3a74
  1. service-t/
  2. tests/