Merge changes I2360314c,I51bd32c6,Icb136327,Id8425488

* changes:
  adb-remount-test: Refactor test cleanup
  adb-remount-test: Replace libc.so test with build.prop test
  adb-remount-test: Check override_creds only if overlayfs is used
  adb-remount-test: Print log timestamp & auto-detect color