Add options for jumphost in netconf connetion

Fixes #37262
Fixes #36284

*  Updates options in netconf connection to enable
   bastion/jump host setting using configuration/enviornment
   varaibles.
*  Update troubleshooting docs from using bastion host with netconf
   connection

lib/ansible/config/base.yml

@@ -1632,4 +1632,12 @@ YAML_FILENAME_EXTENSIONS:
     - section: defaults
       key: yaml_valid_extensions
   type: list
+NETCONF_SSH_CONFIG:
+  description: This variable is used to enable bastion/jump host with netconf connection. The bastion/jump
+               host ssh settings should be present in ssh configuration file (~/.ssh/config).
+  env: [{name: ANSIBLE_NETCONF_SSH_CONFIG}]
+  ini:
+  - {key: ssh_config, section: netconf_connection}
+  yaml: {key: netconf_connection.ssh_config}
+  type: boolean
 ...