Fix a couple broken unittests.

1) Use mock to mock out call to find stateful update script.
2) Change timeout value to 240 given change to base timeout.

BUG=chromium:246372 chromium:243922
TEST=Ran unittests

Change-Id: Ica7b598f96404e6bf13408df8cf60853000b1101
Reviewed-on: https://gerrit.chromium.org/gerrit/58412
Tested-by: Chris Sosa <sosa@chromium.org>
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Commit-Queue: Chris Sosa <sosa@chromium.org>
2 files changed