fixes exception being raised when show configuration command issued (#5047)

The junos_command expects commands to be returned as xml by default but
`show configuration [options]` will return text not xml.  This fix
will set the output format for any command that starts with `show
configuration` to text

fixes #4628

network/junos/junos_command.py

@@ -205,6 +205,10 @@ def parse(module, command_type):
 
         item['command_type'] = command_type
 
+        # show configuration [options] will return as text
+        if item['command'].startswith('show configuration'):
+            item['output'] = 'text'
+
         parsed.append(item)
 
     return parsed