commit 744a0d5b0315bf527fdbc820ac0e6c34326be9ea
author xingdai <xingdai@google.com> Mon Mar 20 20:02:14 2017 -0700
committer xingdai <xingdai@google.com> Mon Mar 20 20:10:44 2017 -0700
tree 1eb1207074e4908ff332a91231f7e0af62f3d295
parent d8839d5d3d6a8227b1417b1cf7bd42da578022ec

Migrate ColossusLogSaver to AndroidBuildAPILogSaver.

Previously the unit-runner uses ColossusLogSaver and sets the stage path
to nfs (/auto/android-test/www/test_logs), and it's not deleted after
testing (this may be a leaking, check /auto/android-test/www/test_logs/tradefed)
We are migrate ColossusLogSaver to AndroidBuildAPILogSaver. And we use
/tmp/stage-android-build-api as stage root folder. The folder itself can
not be deleted, but the actual invocation folder in it will be cleared.

Bug: 31152039
Change-Id: I6afc6cd4de80b224ed0c7d0e268c3896a1b832e6