RFA: New regression test for breakpoint command freeing

[Michael Elizabeth Chastain]

Hi Jim,

The new test is doing its job.  In 26 test runs, I got:

  22  Invalid control type
   3  GDB Died
   1  PASS

Is there a PR for this bug?  If not, can you file one?  Then change the
FAIL's to KFAIL's with the PR number on it.  That way I can tell the
"Invalid control type" from truly unexpected bugs.

Also, freebpcmd.c needs a copyright notice.

Michael C