Added support for building redhat isos and updated simp rpm deps (#885)

Prerelease of 6.6.0-2

We're pleased to announce the general availability of SIMP 6.6.0-1!

The [SIMP yum repositories][0] have been updated with the new release.
A new [SIMP ISO][1] is also available for download.

Please note that this release is currently only available for EL 8.

[0]: https://download.simp-project.com/simp/yum/releases/6.6.0-1/
[1]: https://download.simp-project.com/simp/ISO/SIMP-6.6.0-1.el8Stream-CentOS-8.0-x86_64.iso

Prerelease of 6.6.0-1

6.6.0 pre-release to stage/test RPMs

Update FIPS pin (#858)

Update FIPS pin (#858)

Use the `ignores` capability from simp-rake-helpers

* Bump the version of `simp-rake-helpers`
* Update the RPM deps file to use `ignores` instead of overriding everything

Closes: #855
Needs: simp/rubygem-simp-rake-helpers#196

Pre-release of 6.6.0-Alpha7

Update simplib, simp_snmpd

Package Update

Related: #783