Single threaded fixes for osc/pt2pt#2613

hppritcha merged 3 commits intoopen-mpi:v2.xopen-mpi/ompi:v2.xfrom

jjhursey:pr/v2.x/osc-pt2pt-1-thread-fixesjjhursey/ompi:pr/v2.x/osc-pt2pt-1-thread-fixesCopy head branch name to clipboard