move jsonfile cache plugin back to ansible-base (#287)

* move jsonfile cache plugin back to ansible-base

* Delete remove_jsonfile.yml

No needed as we haven't released `community.general` yet

Co-authored-by: John R Barker <john@johnrbarker.com>

plugins/cache/jsonfile.py

@@ -1,62 +0,0 @@
-# (c) 2014, Brian Coca, Josh Drake, et al
-# (c) 2017 Ansible Project
-# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
-
-# Make coding more python3-ish
-from __future__ import (absolute_import, division, print_function)
-__metaclass__ = type
-
-DOCUMENTATION = '''
-    cache: jsonfile
-    short_description: JSON formatted files.
-    description:
-        - This cache uses JSON formatted, per host, files saved to the filesystem.
-    author: Ansible Core (@ansible-core)
-    options:
-      _uri:
-        required: True
-        description:
-          - Path in which the cache plugin will save the JSON files
-        env:
-          - name: ANSIBLE_CACHE_PLUGIN_CONNECTION
-        ini:
-          - key: fact_caching_connection
-            section: defaults
-      _prefix:
-        description: User defined prefix to use when creating the JSON files
-        env:
-          - name: ANSIBLE_CACHE_PLUGIN_PREFIX
-        ini:
-          - key: fact_caching_prefix
-            section: defaults
-      _timeout:
-        default: 86400
-        description: Expiration timeout in seconds for the cache plugin data. Set to 0 to never expire
-        env:
-          - name: ANSIBLE_CACHE_PLUGIN_TIMEOUT
-        ini:
-          - key: fact_caching_timeout
-            section: defaults
-        type: integer
-'''
-
-import codecs
-import json
-
-from ansible.parsing.ajson import AnsibleJSONEncoder, AnsibleJSONDecoder
-from ansible.plugins.cache import BaseFileCacheModule
-
-
-class CacheModule(BaseFileCacheModule):
-    """
-    A caching module backed by json files.
-    """
-
-    def _load(self, filepath):
-        # Valid JSON is always UTF-8 encoded.
-        with codecs.open(filepath, 'r', encoding='utf-8') as f:
-            return json.load(f, cls=AnsibleJSONDecoder)
-
-    def _dump(self, value, filepath):
-        with codecs.open(filepath, 'w', encoding='utf-8') as f:
-            f.write(json.dumps(value, cls=AnsibleJSONEncoder, sort_keys=True, indent=4))