Cleanup the passing of MCA params on the orted cmd line in ssh by ensuring that we quote all values since they could be multi-word and/or contain special characters. Thanks to Dirk Schubert for pointing it out.

cmr=v1.8.2:reviewer=jsquyres
Fix set-but-unused-warning noticed by jsquyres.

cmr=v1.8.2:reviewer=jsquyres
HCOLL: fix misplaced hcoll_init return value check.

cmr=v1.8.2:reviewer=jladd