Fixes #4341: Move r30943 to v1.7 branch (OSHMEM: fix use of opal_verbose)

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r30943 [[BR]]
OSHMEM: fix use of opal_verbose

fixed by Roman, reviewed by Igor/Mike

cmr=v1.7.5:reviewer=ompi-rm1.7
Fixes #4343: Move r30944 to v1.7 branch (Two minor usnic fixes)

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r30944 [[BR]]
Two minor usnic fixes

* clang warning stomp
* memory barrier for volatile variable use

These can go to 1.7.5 or can slip to v1.8 -- RM decision.

Submitted by Jeff Squyres, reviewed by Dave Goodell

cmr=v1.7.5:reviewer=ompi-rm1.7