Fix junos_command py3 related issues (#36782)

Fixes #36204

*  tostring() input string shoulb be in byte string format
*  to_ele() input is required in unicode format

lib/ansible/plugins/netconf/__init__.py

@@ -102,7 +102,7 @@ class NetconfBase(with_metaclass(ABCMeta, object)):
         """RPC to be execute on remote device
            :name: Name of rpc in string format"""
         try:
-            obj = to_ele(to_bytes(name, errors='surrogate_or_strict'))
+            obj = to_ele(name)
             resp = self.m.rpc(obj)
             return resp.data_xml if hasattr(resp, 'data_xml') else resp.xml
         except RPCError as exc:

lib/ansible/plugins/netconf/junos.py

@@ -50,7 +50,7 @@ class Netconf(NetconfBase):
         device_info['network_os'] = 'junos'
         ele = new_ele('get-software-information')
         data = self.execute_rpc(to_xml(ele))
-        reply = to_ele(to_bytes(data, errors='surrogate_or_strict'))
+        reply = to_ele(data)
         sw_info = reply.find('.//software-information')
 
         device_info['network_os_version'] = self.get_text(sw_info, 'junos-version')