don't break on test redefinition

don't break on test redefinition

There are no duplicate tests, but recompiling a test file
interactively ends up in the debugger, so set *BREAK-ON-REDEFINITION*
to NIL (as it had been before the recent commit d414782).

Also, fix the warning message and its arguments.

tests run: lisp-prepush
tests added: no
release-note: no, test only change

Change-Id: I430cff46846789c06dceaab3115d6148f499f157
Reviewed-on: https://gerrit.franz.com:9080/4702
Reviewed-by: Gabor Melis <gmelis@franz.com>
Reviewed-by: Ahmon Dancy <dancy@franz.com>
Reviewed-by: Kevin Layer <layer@franz.com>
Tested-by: Kevin Layer <layer@franz.com>