openvpnmsica, tapctl: "interface" => "adapter"

openvpnmsica, tapctl: "interface" => "adapter"

Interface is not equal to adapter. A quote from Microsoft documentation:

> There is a one-to-one correspondence between the interfaces and
> adapters on a given computer. An interface is an IP-level abstraction,
> whereas an adapter is a datalink-level abstraction.

As tapctl and openvpnmsica are all about managing network adapters on
Windows computers, the terminology has been updated.

Signed-off-by: Simon Rozman <simon@rozman.si>
Acked-by: Lev Stipakov <lstipakov@gmail.com>
Message-Id: <20200309131728.380-7-simon@rozman.si>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg19529.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>