Remove keyring workaround for rhel-8
Remove keyring workaround for rhel-8

Patch for this workaround landed in FreeIPA 4.8.
See: https://github.com/freeipa/freeipa/commit/165a941109a9a5f7ac8f85bdda93b4132875a7b1

freeipa/freeipa-container,adelton/docker-freeipa