fix bug 1471299: remove orphaned code the submitter used
fix bug 1471299: remove orphaned code the submitter used

We rewrote the stage submitter as an AWS Lambda job and no longer have
the stage submitter code in the socorro repo. This removes some code
that the submitter used that we no longer use and has no tests.

mozilla/socorro,lonnen/socorro,mozilla/socorro,lonnen/socorro,lonnen/socorro,mozilla/socorro,mozilla/socorro,mozilla/socorro,lonnen/socorro,mozilla/socorro