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

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



Change-Id: Icc9307d2c177f4e50787cce688cd0b1c55bbd4cc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>