fixes iosxr configure method to commit the changes

The iosxr configure method did not send the commit command to active the
changes after pushed to the remote device.  This change address that problem

lib/ansible/module_utils/iosxr.py

@@ -69,7 +69,10 @@ class Cli(CliBase):
 
     def configure(self, commands, **kwargs):
         cmds = ['configure terminal']
+        if commands[-1] == 'end':
+            commands.pop()
         cmds.extend(to_list(commands))
+        cmds.extend(['commit', 'end'])
         responses = self.execute(cmds)
         return responses[1:]