PP-610: On a Cray X-series, periodically synchronize PBS with ALPS inventory

[billnitzberg]

@djohnpbs

The current design is for Cray systems. If others are aware of possible uses in non-Cray environments (and enabling/disabling the hook depending on platform), please comment.

As pointed out in the PP-586 discussion, even Cray systems often include non-Cray MOMs:

@sgombosi

We currently have multiple sites that are running a combination of multiple Cray systems and either non-Cray or Cray MAMU nodes as part of a single PBS complex.

I believe a PBS hook can only be enabled/disabled for the entire PBS cluster, so the design should ensure that the hook behaves sanely on non-Cray MOMs as well as doing it’s job on Cray X-series MOMs. (Detecting that it is not running on an X-series MOM and exiting gracefully would be one approach.)