New idrange management module

There is a new idrange management module placed in the plugins folder:

    plugins/modules/ipaidrange.py

The idrange module allows to ensure presence and absence of idranges.

Here is the documentation of the module:

    README-idrange.md

New example playbooks have been added:

    playbooks/idrange/idrange-absent.yml
    playbooks/idrange/idrange-ad-posix-present.yml
    playbooks/idrange/idrange-ad-present.yml
    playbooks/idrange/idrange-present.yml

New tests for the module can be found at:

    tests/idrange/test_idrange.yml
    tests/idrange/test_idrange_client_context.yml