OSHMEM: fix check-help-string.pl errors and warnings.

This commit was SVN r32511.
(cherry picked from commit e974bec57e7f9ff7fd9705291f6d11a2ecc69308)

open-mpi/ompi@e974bec57e7f9ff7fd9705291f6d11a2ecc69308
@miked-mellanox @jladd-mlnx