genconfig: Convert OVPN_ROUTES to array

* Convert to an array to simplify the code.
* This breaks running `ovpn_genconfig` multiple times with the same
  route argument as the array will just grow.  This needs to be fixed in
  the future.
* Recommended way to work around this is to remove ovpn_env.sh.

bin/ovpn_run

@@ -21,8 +21,8 @@ fi
 if [ "$OVPN_DEFROUTE" != "0" ];then
     iptables -t nat -A POSTROUTING -s $OVPN_SERVER -o eth0 -j MASQUERADE
 
-    for i in ${OVPN_ROUTES[@]}; do
-        iptables -t nat -A POSTROUTING -s $i -o eth0 -j MASQUERADE
+    for i in "${OVPN_ROUTES[@]}"; do
+        iptables -t nat -A POSTROUTING -s "$i" -o eth0 -j MASQUERADE
     done
 fi