tools/appsre-ansible: retry subscribing rpmbuild machines

[croissanne]

Also unsubscribe after the build is done.

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Packer builds are failing with

10:18:52 TASK [Subscribe] ***************************************************************
10:19:18 fatal: [44.203.59.246]: FAILED! => {"changed": false, "cmd": "/sbin/subscription-manager register --org **** --activationkey VALUE_SPECIFIED_IN_NO_LOG_PARAMETER", "msg": "Remote server error. Please check the connection details, or see /var/log/rhsm/rhsm.log for more information.", "rc": 70, "stderr": "Remote server error. Please check the connection details, or see /var/log/rhsm/rhsm.log for more information.\n", "stderr_lines": ["Remote server error. Please check the connection details, or see /var/log/rhsm/rhsm.log for more information."], "stdout": "", "stdout_lines": []}

sometimes. Let's just retry like we do in the other playbook.