Merge "Pull common methods into shell_utils.sh, which can be included by...

Merge "Pull common methods into shell_utils.sh, which can be included by scripts." am: 89a9f55d am: db9ad6a1 am: 5b8250d6

Original change: https://android-review.googlesource.com/c/platform/build/+/2328802



Change-Id: Ie34b795d084c4b4ab7b77a3e135d2e89e408fd90
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>