Fixes #22845 - Install python-requests with Ansible

[dLobatog]

The callback needs this. It's already a very common package to have, but
if there's a clean installation of Foreman without Pulp, it will not be
there and the callback will not run until this dependency is installed.

[theforeman-bot]

@dLobatog, the Redmine ticket used is for a different project than the one associated with this GitHub repository. Please either:

• check #22845: python-requests should be installed for the callback is the correct one
• move ticket #22845 from Ansible to the Installer project
• or file a new ticket in the Installer project

If changing the ticket number used, remember to update the PR title and the commit message (using git commit --amend).

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This message was auto-generated by Foreman's prprocessor

[theforeman-bot]

@dLobatog, the Redmine ticket used is for a different project than the one associated with this GitHub repository. Please either:

• check #22845: python-requests should be installed for the callback is the correct one
• move ticket #22845 from Ansible to the Installer project
• or file a new ticket in the Installer project

If changing the ticket number used, remember to update the PR title and the commit message (using git commit --amend).

---

This message was auto-generated by Foreman's prprocessor

[mmoll]

test failures unrelated, AFAICT

[mmoll]

merged, gracias @dLobatog!