Description of problem:
Step to enable Satellite Tools repository is removed from "Content Host Registration" page


Version-Release number of selected component (if applicable):
Satellite 6.7 Beta

How reproducible:
Always 

Steps to Reproduce:
1. Navigate to Hosts -> Content Hosts -> Register A Host 
2. Check the instructions to register and install katello-host-tools/katello-agent packages 
3. These packages (katello-host-tools, katello-agent) come from Satellite Tools repository so it is mandatory to enable the Tools repo. 

Actual results:

Currently, the page has only 4 steps:

1. Select a Content Source:
2. Install the pre-built bootstrap RPM:
3. Register using subscription-manager:
4. Install client package:

Till Satellite 6.6 we have 5 steps as below:

1. Select a Content Source:
2. Install the pre-built bootstrap RPM:
3. Register using subscription-manager:
4. Enable satellite-tools repository if you want to use client tools such as katello-agent or puppet:
5. Install client package:


Expected results:
Step to enable Satellite-Tools repo should be added. 

# subscription-manager repos --enable=rhel-\*-satellite-tools-\*-rpms

Also, above command does not work for RHEL 8 Satellite Tools repo so need to have a subcommand for RHEL 8 repo which is reported in the bz : https://bugzilla.redhat.com/show_bug.cgi?id=1798458


Additional info: