f3cda67d9f
OpenVPN 2.7 Windows DCO passes username but NOT password as
environment variable with via-env mode. Switched to via-file:
server.conf: auth-user-pass-verify script via-file
verify.sh reads credentials from temp file ():
line 1 = username, line 2 = password
Also added pass_len to debug log so we can immediately see
if the password was actually received by the script.