Fix a couple issues found when running ctest locally.

A couple issues cropped up when helping aviv debug ctest changes.
1) The --disk_layout change was never propagated to lib/test_helper
2) --only_verify without --quick should do the right thing.

This CL fixes both issues.

BUG=None
TEST=Ran it a few times with/without qemu image.

Change-Id: I072b8ef00aa08ac86e7a8d2677cd40fca3a0078c
Reviewed-on: https://gerrit.chromium.org/gerrit/64403
Tested-by: Chris Sosa <sosa@chromium.org>
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Commit-Queue: Chris Sosa <sosa@chromium.org>
2 files changed