[feat] try other gateways if the main one fails

Removing '--persist-ip' param on openvpn it will try to connect to a different gateway if the first one fails. This means, that in case of network disconnection for some minutes bitmask will keep rotating between the different gateways and one the network comes back it will not connect anymore to the first one, but to the one that was trying at this moment.

• Resolves: #9188