Automatically verify sample config is up to date

Update the pep8 test job to run the script that verifies that the sample
config file is up to date.  If an option is added, changed, or removed,
but the sample config is not updated, tests will now fail.

Change-Id: I9e396af910e670c164407d9dc244e16850d07a0e
Merge "Automatically verify sample config is up to date"