redhat_subscription: Fix usage of ConfigParser

[cnsnyder]

SUMMARY

This PR fixes an issue in the usage of configparser in the redhat_subscription module. The configparser module is imported from ansible.module_utils.six.moves as of f75ffe4. After that change was made, any attempt to use the redhat_subscription module with an ansible_python_interpreter of python 3+ fail with the following:

FAILED! => {"changed": false, "msg": "Failed to register with 'https://subscription.rhsm.stage.redhat.com/subscription': option values must be strings"}

The error ultimately comes from passing integers to ConfigParser.set where strings were expected when updating the rhsm and rhn yum plugin configurations (under /etc/yum/pluginconf.d/).

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

redhat_subscription

ADDITIONAL INFORMATION

This issue seems only to surface when a python 3 interpreter is used on the target machine(s).
Here's a sample inventory file for my reproducer (named inv):

[all:vars]
ansible_connection=ssh
ansible_user=root
ansible_ssh_pass=redhat

[local]
192.168.121.179 ansible_python_interpreter="/usr/bin/env python3"

The playbook used is as follows (named test.yml):

---
- hosts: "local"
  become: yes
  tasks:
    - name: Register the machine
      redhat_subscription:
        state: present
        server_hostname: https://candlepin.example.com:8443/candlepin
        username: admin
        password: admin
        auto_attach: true

With these files in place execute: ansible-playbook test.yml -i ./inv
Output:

TASK [Register with stage] *******************************************************************************************************************************************************************
fatal: [192.168.121.179]: FAILED! => {"changed": false, "msg": "Failed to register with 'https://candlepin.example.com:8443/candlepin': option values must be strings"}

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[samdoran]

Please create a changelog fragment. See this fragment as an example.

[cnsnyder]

@samdoran I've added a changelog fragment as requested. Is there anything else this PR needs?

[mkrizek]

@cnsnyder Thanks!