Revert the `fallback` naming into `default` network

There is strong opposition in the team to this rename.
Reverting to the old language.

Test: FrameworksNetTests
Change-Id: Icefa3090966c07fd66692ddd5b44dfc94485a914
2 files changed
tree: c15ffbe0e139c503145d92b3edddd739e555dccd
  1. core/
  2. framework/
  3. service/
  4. services/
  5. tests/
  6. OWNERS