Move DirExists and FileHasContent to utils library

Bug: 110478603
Test: local & gce
Change-Id: I0c04877698a586c0723fe6c6f896f3e85973af0c
Merged-In: I0c04877698a586c0723fe6c6f896f3e85973af0c
(cherry picked from commit 02f464c52a21c8197480b688d22fe571284f3a2e)
4 files changed
tree: 360f4ff2b9103eeb51727207229e196410fbf60f
  1. common/
  2. guest/
  3. host/
  4. tests/
  5. tools/
  6. Android.bp
  7. Android.mk
  8. OWNERS