In order to address issue #741, the orted's now are
always launched with the Cray PMI environment variables
PMI_NO_FORK
PMI_NO_PREINITIALIZE
set to disable running of the library's ctor.
So there's no longer a need to set these for the
application(s) being launched by the orted's.
Signed-off-by: Howard Pritchard <howardp@lanl.gov>