security/openvpn: fix test suite when ifconfig emits ::1/128 address …

…format

Some systems apparently format output of ifconfig lo0 similar to
"inet6 ::1/128" instead of 12.1's "inet6 ::1 prefixlen 128". This
confuses the test script, so strip the slash and trailing prefixlen
off.

Since that bug affects the build-time test suite and its occurrence
breaks the build, no PORTREVISION bump needed.

Reported by:	des@

security/openvpn/files/patch-tests__t_cltsrv.sh

@@ -40,7 +40,7 @@
 +    add='proto udp6 '
 +fi
 +for i in server client ; do
-+    sed -e "s/localhost/$2/" -e "/^remote /a\\
++    sed -e "s|localhost|${2%/*}|" -e "/^remote /a\\
 +$add" ${root}/sample-config-files/loopback-$i \
 +    >${root}/sample-config-files/loopback-$i.test
 +done