Quote the domain name argument passed to the wmic command

Quote the domain name argument passed to the wmic command

It appears wmic needs domain names containing hyphens to
be quoted.

Trac #1375

Signed-off-by: Selva Nair <selva.nair@gmail.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1613520275-28637-1-git-send-email-selva.nair@gmail.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg21570.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 3338f2d5a2b7f12f314cc53bf0eaa44ba4f2e58c)