Description of problem:
For each host, we show a 'Run Puppet' button, that currently requires manual set up and does not integrate nicely with the new REX framework.

Ideally, the 'Run Puppet' functionality should just forward to the 'Run Puppet Once' job template. Otherwise, this eternally grayed out button will raise eyebrows and questions.

Considering we have the required parts in place now (SSH authentication for REX is there anyway), we could enable it (by default) by:
- editing the default /etc/foreman/settings.yaml to enable puppetrun
- editing the default /etc/foreman-proxy/settings.d/puppet.yml to:
  - set :puppet_provider to puppetssh
  - set :puppetssh_keyfile to /usr/share/foreman-proxy/.ssh/id_rsa_foreman_proxy (the key we use for REX as well)

This still doesn't integrate with REX nicely, but at least it works out of the box this way (for new hosts that have the public key).

Alternatively, the 'Run Puppet' button could be hidden and people would just rely on 'Run job'.

Version-Release number of selected component (if applicable):
SNAP 7.1

How reproducible:


Steps to Reproduce:
1. Open host page
2. Focus eyes on right most corner of white part of screen, next to 'Delete'
3.

Actual results:
'Run Puppet' button is grayed out and visible.

Expected results:
Button is either hidden on usable (preferably by default, preferably through REX)

Additional info: