Small changes to be able to use this code as ansible collection

[bartowl]

With ansible 2.10 ansible-galaxy suports collections, which consist of multiple roles packed and versioned as one thing.
This entire repository would require just very tiny changes to be considered as a ansible-galaxy collection.

This would allow fetching of particular version just by having requirements.yml file containing something like:

collections:
  - name: https://github.com/opitzconsulting/ansible-oracle
    type: git
    version: oc #(or any other branch/tag)

Then, before starting ansible on own config or inventory repo one would just need to execute following command:
ansible-galaxy collection install -r requirements.yml -p collections/
this would download entire ansible-oracle repository and place it under collections directory.

The usage of roles would then look identical, but the ansible play would need following lines added:

- name: Oracle Host configuration
  collections:
    - opitzconsulting.ansible-oracle #to be defined in top-level galaxy.yml file that would need to be created
  hosts: "{{ hostgroup }}"
  roles:
    - common
    - orahost
    ...

The changes required for this would be adding galaxy.yml file in top level, and for each role meta/main.yml with galaxy_{info,tags} . It would be also advised to move python modules from /libraries to /plugins/modules to comply with ansible-collection repository format. No other changes would be required!

With this issue it is also not intended to upload the collection to ansible-galaxy repositories (at least for now). It can be used by just referencing github branch/tag or even within forks...

Please qualify this Issue, when it will be ok i have already all changes needed for it and can easily prepare PR for that.

Best Regards,
BartOwl