Enable FIPS on RHEL

[mjnagel]

RedHat documentation says that a system may not be fully compliant unless the install was started in FIPS mode. This leaves us with a few options for handling FIPS on RHEL:

• Switch off of cloud images to a full ISO install so that we can install in FIPS mode: This would require a decent switch to how we do packer images (starting from ISO), and also have an impact on license handling since cloud images give us licensing for free
• Find a RHEL, FIPS enabled cloud base image: May have cost impacts/availability impacts in other environments
• Enable FIPS during the packer build: FIPS compliance may not be fully achieved - unclear if we can check this somehow

There may be other viable options but these are the most prominent/apparent options.

[jacobbmay]

Realized I never circled back on this. My solution for on prem images was to build our own base RHEL image by installing from ISO in FIPS mode and then use that as the base image for this packer builder in Nutanix. Probably doesn't help with AWS environments due to cloud licensing concerns, but at least for on prem systems it is a workable solution since RedHat's cloud-image builder doesn't support producing a FIPS enabled cloud image.