Pull persistent connection parameters via get_option (#39367)

* WIP Pull persistent connection parameters via get_option

* Fix pep8

* Add use_persistent_connection setting to paramiko_ssh plugin

* Add vars section to persistent_command_timeout setting and prevail provider values over config manager

* Use persistent_command_timeout on network_cli instead of timeout

* Fix unit tests

If we don't call loader to get network_cli, then _load_name is never
set and we get KeyError.

* Pull persistent_command_timeout via config  manager for ios connection local

* Pull persistent_command_timeout via config manager on connection local

lib/ansible/plugins/connection/paramiko_ssh.py

@@ -114,8 +114,16 @@ DOCUMENTATION = """
             version_added: '2.5'
           - name: ansible_paramiko_host_key_checking
             version_added: '2.5'
+      use_persistent_connections:
+        description: 'Toggles the use of persistence for connections'
+        type: boolean
+        default: False
+        env:
+          - name: ANSIBLE_USE_PERSISTENT_CONNECTIONS
+        ini:
+          - section: defaults
+            key: use_persistent_connections
 # TODO:
-#C.USE_PERSISTENT_CONNECTIONS:
 #timeout=self._play_context.timeout,
 """
 
@@ -188,7 +196,7 @@ class MyAddPolicy(object):
             fingerprint = hexlify(key.get_fingerprint())
             ktype = key.get_name()
 
-            if C.USE_PERSISTENT_CONNECTIONS or self.connection.force_persistence:
+            if self.connection.get_option('use_persistent_connections') or self.connection.force_persistence:
                 # don't print the prompt string since the user cannot respond
                 # to the question anyway
                 raise AnsibleError(AUTHENTICITY_MSG[1:92] % (hostname, ktype, fingerprint))