Global VPN feature [1/2]

* Modify existing VPN user range functions to conditionally have traffic
  from all users pass through the global VPN.
  These functions are called when:
    1. Starting a VPN
    2. Adding a user
    3. Removing a user
* Disallow starting VPNs in secondary users when a global VPN is set

Also includes:
Author: Oliver Scott <olivercscott@gmail.com>
Date: 2021-08-27 16:30:22 -0400

    Show Global VPN icon on all users

    Change-Id: I496c0abbdf92b8f823bc57b297473aa14bd968c8

Change-Id: I42616cc1f4e39e1dad739d81f6d5c55e218be995
Signed-off-by: Mohammad Hasan Keramat J <ikeramat@protonmail.com>