Add support for cliconf and netconf plugin (#25093)

* ansible-connection refactor and action plugin changes
* Add cliconf plugin for eos, ios, iosxr, junos, nxos, vyos
* Add netconf plugin for junos
* Add jsonrpc support
* Modify network_cli and netconf connection plugin
* Fix py3 unit test failure
* Fix review comment
* Minor fixes
* Fix ansible-connection review comments
* Fix CI issue
* platform_agnostic related changes

lib/ansible/module_utils/connection.py

@@ -29,9 +29,13 @@
 import signal
 import socket
 import struct
+import os
+import uuid
+
+from functools import partial
 
 from ansible.module_utils.basic import get_exception
-from ansible.module_utils._text import to_bytes, to_native
+from ansible.module_utils._text import to_bytes, to_native, to_text
 
 
 def send_data(s, data):
@@ -75,4 +79,63 @@ def exec_command(module, command):
 
     sf.close()
 
-    return (rc, to_native(stdout), to_native(stderr))
+    return rc, to_native(stdout), to_native(stderr)
+
+
+class Connection:
+
+    def __init__(self, module):
+        self._module = module
+
+    def __getattr__(self, name):
+        try:
+            return self.__dict__[name]
+        except KeyError:
+            if name.startswith('_'):
+                raise AttributeError("'%s' object has no attribute '%s'" % (self.__class__.__name__, name))
+            return partial(self.__rpc__, name)
+
+    def __rpc__(self, name, *args, **kwargs):
+        """Executes the json-rpc and returns the output received
+           from remote device.
+           :name: rpc method to be executed over connection plugin that implements jsonrpc 2.0
+           :args: Ordered list of params passed as arguments to rpc method
+           :kwargs: Dict of valid key, value pairs passed as arguments to rpc method
+
+           For usage refer the respective connection plugin docs.
+        """
+
+        reqid = str(uuid.uuid4())
+        req = {'jsonrpc': '2.0', 'method': name, 'id': reqid}
+
+        params = list(args) or kwargs or None
+        if params:
+            req['params'] = params
+
+        if not self._module._socket_path:
+            self._module.fail_json(msg='provider support not available for this host')
+
+        if not os.path.exists(self._module._socket_path):
+            self._module.fail_json(msg='provider socket does not exist, is the provider running?')
+
+        try:
+            data = self._module.jsonify(req)
+            rc, out, err = exec_command(self._module, data)
+
+        except socket.error:
+            exc = get_exception()
+            self._module.fail_json(msg='unable to connect to socket', err=str(exc))
+
+        try:
+            response = self._module.from_json(to_text(out, errors='surrogate_then_replace'))
+        except ValueError as exc:
+            self._module.fail_json(msg=to_text(exc, errors='surrogate_then_replace'))
+
+        if response['id'] != reqid:
+            self._module.fail_json(msg='invalid id received')
+
+        if 'error' in response:
+            msg = response['error'].get('data') or response['error']['message']
+            self._module.fail_json(msg=to_text(msg, errors='surrogate_then_replace'))
+
+        return response['result']