HPC puppet config improvements w.r.t. provisioning

[ja5087]

Upgrading corruption and segfault has been a very painful process given us opportunities to learn about the state of our Puppet code for reprovisioning them. A number of things are not going to be suitable for Puppet to manage but there are a number of improvements we could make:

• Configure the iSCSI initiator in Puppet. We could also do the target but support for iSCSI better be really good.
• Configure the NFS export on corruption
• Configure the /home mounts on both machines.
• Fix the initial race condition for provisioning /etc/slurm-llnl-slurm.conf where the puppetdb variable is always false before the first puppet run.
• Singularity no longer has new versions in official Debian repos but they recommend some third party repos.

Finally there are just some things that are specific to corruption and maybe it'd be nice to keep some logs/docs of things we solved last time we ran into this.