openvpnmsica: add ovpn-dco custom actions

openvpnmsica: add ovpn-dco custom actions

Add two custom actions to service ovpn-dco driver installation.

 - EvaluateDriver

Runs under user privileges. Determines what action (install/uninstall)
should be performed on ovpn-dco component.

 - ProcessDriver

Runs under SYSTEM privileges. Performs driver (un)installation.
During uninstall, all existing adapters with given hwid (ovpn-dco)
are removed.

The logic is inspired by custom actions from tap-windows6 installer
(https://github.com/OpenVPN/tap-windows6/tree/master/msm).

Signed-off-by: Lev Stipakov <lev@openvpn.net>
Signed-off-by: Simon Rozman <simon@rozman.si>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20220214122409.260-1-lstipakov@gmail.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg23786.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>