OSHMEM: Add two new mca variables

Added use_hp flag in sshmem/sysv variable to control huge page usage;
Added shared_mr sshmem/verbs;
Both paraemetes are set in auto.
Fix help messages

fixed by Igor, reviewed by @miked-mellanox and @alex-mikheev
(cherry picked from commit d82dc7f67f47b326888ddb0dc846536f99b40d28)
Merge pull request #7 from miked-mellanox/topic/oshmem_add_two_new_mca_variables

Add-two-new-mca-variables, fix opal_help failure