[autotest] Ensure that ownership state is properly cleaned during test setup

The session_manager persists signed settings back to disk on graceful exit.  As such, removing the signed settings file and then killing the session manager does nothing.  The right thing to do is take down the UI, fiddle with the on-disk state, and then bring the UI back up again.

BUG=14008
TEST=suite_Smoke a couple times in a row.
STATUS=Fixed

Change-Id: Iec2dffc98849bd62229ade645509aaf5439c6fff

Revert "Disable OwnershipTaken, OwnershipNotRetaken"

This reverts commit 136bbe09befb71b2c5e10d706908f6bdb8989987.

R=davemoore@chromium.org

Review URL: http://codereview.chromium.org/6825028
4 files changed