ios_user_global - Take in count no username question

Currently, on IOS devices, when you enter a `no username` command, the
system request you a question to confirm the suppression.

To handle this part, I have put a "dedicated" command for the remove
part of username part to send also a y juste after the no username
command

plugins/module_utils/network/ios/rm_templates/user_global.py

@@ -76,6 +76,7 @@ def __init__(self, lines=None, module=None):
                 (\s(?P<value>\S+))?
                 """, re.VERBOSE,
             ),
+            "remval": r"username {{ name }}\ry",
             "setval": "username {{ name }}"
                       "{{ ' privilege ' + privilege|string if privilege is defined and 0 <= privilege|int <= 15 and privilege|int != 1 else '' }}"
                       "{% if 'type' in password and password.type == 'password' %}"