Remove DigitalOcean modules (moved to community.digitalocean) (#622)

* Remove DigitalOcean modules.

* Remove inventory scripts.

plugins/doc_fragments/digital_ocean.py

@@ -1,33 +0,0 @@
-# -*- coding: utf-8 -*-
-
-# Copyright: (c) 2018, Ansible Project
-# Copyright: (c) 2018, Abhijeet Kasurde (akasurde@redhat.com)
-# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
-
-from __future__ import (absolute_import, division, print_function)
-__metaclass__ = type
-
-
-class ModuleDocFragment(object):
-    # Parameters for DigitalOcean modules
-    DOCUMENTATION = r'''
-options:
-  oauth_token:
-    description:
-     - DigitalOcean OAuth token.
-     - "There are several other environment variables which can be used to provide this value."
-     - "i.e., - 'DO_API_TOKEN', 'DO_API_KEY', 'DO_OAUTH_TOKEN' and 'OAUTH_TOKEN'"
-    type: str
-    aliases: [ api_token ]
-  timeout:
-    description:
-    - The timeout in seconds used for polling DigitalOcean's API.
-    type: int
-    default: 30
-  validate_certs:
-    description:
-    - If set to C(no), the SSL certificates will not be validated.
-    - This should only set to C(no) used on personally controlled sites using self-signed certificates.
-    type: bool
-    default: yes
-'''