Fix printing of cmd-line syntax errors when MPI enabled

[chuckyount]

Example:

• make clean; make -j stencil=3axis arch=snb
• bin/yask.sh -ranks 2 -stencil 3axis -arch snb -bad-option

Can only see the following:

YASK Kernel: .
application called MPI_Abort(MPI_COMM_WORLD, 1) - process 1
YASK Kernel: .
application called MPI_Abort(MPI_COMM_WORLD, 1) - process 0

[chuckyount]

Seems to work ok now, even though it prints some MPI stuff after the error:

YASK Kernel: Error: extraneous parameter(s): '-foo'; run with '-help' option for usage.
[mpiexec@chlr15212] handle_pmi_cmd (pm/pmiserv/pmiserv_cb.c:52): Unrecognized PMI command: abort | cleaning up processes
[mpiexec@chlr15212] control_cb (pm/pmiserv/pmiserv_cb.c:280): unable to process PMI command
[mpiexec@chlr15212] HYDT_dmxu_poll_wait_for_event (tools/demux/demux_poll.c:76): callback returned error status
[mpiexec@chlr15212] HYD_pmci_wait_for_completion (pm/pmiserv/pmiserv_pmci.c:198): error waiting for event
[mpiexec@chlr15212] main (ui/mpich/mpiexec.c:344): process manager error waiting for completion

[chuckyount]

No, still broken. Prints message from each MPI rank.