openposix/stress/mqueues: Rename args to match.

This has been broken by 3a48c063457d2bc61605fdcfc9f30a228b2b19c0

As the binary names were renamed, the arg files no longer match. Fix
this by renaming the args files to match again.

Reported-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
Merge ../ltp-dev