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The MPI collectives get and set the errflag used by the collective
helper functions (MPIC_*). The possible values of the errflag changed,
so the collective functions need to appropriately set this value using
either MPIR_ERR_NONE (MPI_SUCCESS), MPIR_ERR_PROC_FAILED
(MPIX_ERR_PROC_FAILED), or MPIR_ERR_OTHER (MPI_ERR_OTHER).

This should allow collectives to correctly report process failures when
they occur now, fixing the FT tests that use collectives (see #1945).
Signed-off-by: Huiwei Lu <huiweilu@mcs.anl.gov>