wintun: set adapter properties via interactive service

wintun: set adapter properties via interactive service

Since Wintun doesn't do DHCP, use interactive service
calls to set up adapter properties.

This also fixes bug in previously unused IPv4 code of
do_address_service():

 - ipv4 address must be in network byte order
 - prefix length cannot be hardcoded /32 but
 must be calculated from netmask

Signed-off-by: Lev Stipakov <lev@openvpn.net>
Acked-by: Simon Rozman <simon@rozman.si>
Message-Id: <20191218061818.1504-1-simon@rozman.si>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg19253.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>