Add error handling for junos in case wrong connection type (#38023)

* Add error handling for junos in case wrong connection type

Fixes #37990

If a junos module doesn't support given connection/transport type
return appropriate error message.

* Fix CI issues

* Fix review comment

lib/ansible/plugins/action/junos.py

@@ -37,6 +37,8 @@ except ImportError:
     from ansible.utils.display import Display
     display = Display()
 
+CLI_SUPPORTED_MODULES = ['junos_netconf', 'junos_command']
+
 
 class ActionModule(_ActionModule):
 
@@ -54,6 +56,13 @@ class ActionModule(_ActionModule):
             pc = copy.deepcopy(self._play_context)
             pc.network_os = 'junos'
             pc.remote_addr = provider['host'] or self._play_context.remote_addr
+
+            if (provider['transport'] == 'cli' and self._task.action not in CLI_SUPPORTED_MODULES) or \
+                    (provider['transport'] == 'netconf' and self._task.action == 'junos_netconf'):
+                return {'failed': True, 'msg': "Transport type '%s' is not valid for '%s' module. "
+                                               "Please see http://docs.ansible.com/ansible/latest/network/user_guide/platform_junos.html"
+                                               % (provider['transport'], self._task.action)}
+
             if self._task.action == 'junos_netconf' or (provider['transport'] == 'cli' and self._task.action == 'junos_command'):
                 pc.connection = 'network_cli'
                 pc.port = int(provider['port'] or self._play_context.port or 22)
@@ -81,8 +90,11 @@ class ActionModule(_ActionModule):
             provider = self._task.args.get('provider', {})
             if any(provider.values()):
                 display.warning('provider is unnecessary when using connection=%s and will be ignored' % self._play_context.connection)
-        else:
+
-            return {'failed': True, 'msg': 'Connection type %s is not valid for this module' % self._play_context.connection}
+            if self._play_context.connection == 'network_cli' and self._task.action not in CLI_SUPPORTED_MODULES:
+                return {'failed': True, 'msg': "Connection type '%s' is not valid for '%s' module. "
+                                               "Please see http://docs.ansible.com/ansible/latest/network/user_guide/platform_junos.html"
+                                               % (self._play_context.connection, self._task.action)}
 
         if (self._play_context.connection == 'local' and pc.connection == 'network_cli') or self._play_context.connection == 'network_cli':
             # make sure we are in the right cli context which should be