Merge changes I37a414a7,I60230559,Ic3715d64

* changes:
  Rename fetcher/main.cc to fetcher/fetch_cvd.cc
  Wait for builds to complete in fetch_cvd.
  Make fetch_cvd flags more concise.
tree: 2d6cd4c416a2f5caaaa8b3a7dc6332b200c1ba7f
  1. common/
  2. guest/
  3. host/
  4. tests/
  5. tools/
  6. Android.bp
  7. Android.mk
  8. OWNERS
  9. TEST_MAPPING