Delete currently unused code. (#16290)

This was kind of confusing, and also caused sphinx-apidoc
to throw strange errors.

lib/ansible/plugins/inventory/__init__.py

@@ -1,81 +0,0 @@
-# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
-#
-# This file is part of Ansible
-#
-# Ansible is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# Ansible is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
-
-#############################################
-
-# Make coding more python3-ish
-from __future__ import (absolute_import, division, print_function)
-__metaclass__ = type
-
-from abc import ABCMeta, abstractmethod
-
-from ansible.compat.six import with_metaclass
-
-class InventoryParser(with_metaclass(ABCMeta, object)):
-    '''Abstract Base Class for retrieving inventory information
-
-    Any InventoryParser functions by taking an inven_source.  The caller then
-    calls the parser() method.  Once parser is called, the caller can access
-    InventoryParser.hosts for a mapping of Host objects and
-    InventoryParser.Groups for a mapping of Group objects.
-    '''
-
-    def __init__(self, inven_source):
-        '''
-        InventoryParser contructors take a source of inventory information
-        that they will parse the host and group information from.
-        '''
-        self.inven_source = inven_source
-        self.reset_parser()
-
-    @abstractmethod
-    def reset_parser(self):
-        '''
-        InventoryParsers generally cache their data once parser() is
-        called.  This method initializes any parser state before calling parser
-        again.
-        '''
-        self.hosts = dict()
-        self.groups = dict()
-        self.parsed = False
-
-    def _merge(self, target, addition):
-        '''
-        This method is provided to InventoryParsers to merge host or group
-        dicts since it may take several passes to get all of the data
-
-        Example usage:
-            self.hosts = self.from_ini(filename)
-            new_hosts = self.from_script(scriptname)
-            self._merge(self.hosts, new_hosts)
-        '''
-        for i in addition:
-            if i in target:
-                target[i].merge(addition[i])
-            else:
-                target[i] = addition[i]
-
-    @abstractmethod
-    def parse(self, refresh=False):
-        if refresh:
-            self.reset_parser()
-        if self.parsed:
-            return self.parsed
-
-        # Parse self.inven_sources here
-        pass
-