tree e9c7e98795b5bdcc756b76f4b90ca265f0566a89
parent b359ab701f2fdb2f700c8cc23b632e78c135dd16
author SzuWei Lin <szuweilin@google.com> 1516092544 +0800
committer SzuWei Lin <szuweilin@google.com> 1517207477 +0800

Revise code of gsi_util help

The patch unifies the code of arguments '--vendor' and '--system',
and to be an argument group 'image sources'.

Bug: 64817940
Test: gsi_util.py for each commands and check the output
Change-Id: I591ef4b922f931b7ceaacc362979156ef830a54e