Merge "Show a warning if adb is not root before gdbclient.py" am: 84eeb1a8e6 am: 16deba10d9 am: b092e69830 am: 9e18a7a354

Original change: https://android-review.googlesource.com/c/platform/development/+/1427154

Change-Id: I73a07a5e7af0f5d9b0e5b820f202339fc2132998