v4.1.x: Update Internal PMIx to OpenPMIx v3.2.1rc1

[jjhursey]

• https://github.com/openpmix/openpmix/releases/tag/v3.2.1rc1

[jjhursey]

Open MPI master uses submodules to pull the internal version, and uses OpenPMIx master. So this is just targeted at v4.1.x.

There are quite a few changes in OpenPMIx v3.2.0 since the OpenPMIx v3.1.5 currently in v4.1.x. This is known to fix some issues with spawn that were reported in openpmix/openpmix#1843. I thought I would post the PR for the RM's consideration in case they want to pull it in.

[abouteiller]

The spawn issue Josh is referring to is here
#8005

[lanl-ompi]

Can one of the admins verify this patch?

[bwbarrett]

bot:aws:retest

[jjhursey]

Adding WIP because:

• I need to update the OMPI side configury to exclude pandoc to pass the build checker
• We will release a 3.2.1 shortly with a couple of fixes - so let's hold this until 3.2.1 is available (relatively soon - next week or so)

[jjhursey]

I updated the branch to OpenPMIx v3.2.1rc1, and disabled the man pages for the OpenPMix internal component (avoids pandoc missing issue in one of the CI bots).

[jsquyres]

bot:ompi:retest