Fix generic/default packages to generic OS

[mtulio]

Describe the bug

The omsagent_requirements has no generic packages:

TASK [omsagent.chaordic : install requirements] ********************************************************************
Friday 14 August 2020  14:44:40 -0300 (0:00:00.125)       0:00:19.846 ********* 
fatal: [3.88.64.61]: FAILED! => {"ansible_facts": {"discovered_interpreter_python": "/usr/bin/python3"}, "changed": false, "msg": "No package matching 'glibc' is available"}
```

## Playbook

Please paste the playbook you are using. (Consider `requirements.yml` and
optionally the command you've invoked.)


```yaml
---
YOUR PLAYBOOK HERE
```

## Output

Show at least the error, possible related output, maybe just all the output.

## Environment

- Control node OS: [e.g. Debian 9] (`cat /etc/os-release`)
- Control node Ansible version: [e.g. 2.9.1] (`ansible --version`)
- Managed node OS: [e.g. CentOS 7] (`cat /etc/os-release`)

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