PMIx_server_register_nspace() is an asynchronous operation, so
the pmix glue wait for it completes before returning.
Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>
pmix1_value_unload() was added a "key" argument which is unused,
and pmix1_value_unload() was sometimes invoked with two arguments instead of three.
since the "key" argument is unused, simply remove it from the
subroutine prototype and calls.