Adds pulp_proxy_url

[jovial]

Pulp requires you to set the proxy for each remote.

[jovial]

This is untested when the pulp_proxy_url is unmodified, but I think you can use omit like this:

---

- hosts: localhost
  vars:
    test: "{{ omit }}"
  tasks:
    - debug:
        msg: "{{ test }}"

[will@juno ~]$ ansible-playbook /tmp/test.yml 
[WARNING]: No inventory was parsed, only implicit localhost is available
[WARNING]: provided hosts list is empty, only localhost is available. Note that the
implicit localhost does not match 'all'

PLAY [localhost] *********************************************************************

TASK [Gathering Facts] ***************************************************************
ok: [localhost]

TASK [debug] *************************************************************************
ok: [localhost] => {
    "msg": "Hello world!"
}

PLAY RECAP ***************************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0 

[jovial]

I've cherry-picked the proxy support to wallaby here: stackhpc/kayobe#18

[markgoddard]

Could you add the same for the Apt repos?

[jovial]

Could you add the same for the Apt repos?

Done