put virtual IPv6 addresses into env

put virtual IPv6 addresses into env

Add missing environment variables for IPv6 virtual addresses:

  * ifconfig_pool_local_ip6
  * ifconfig_pool_remote_ip6
  * ifconfig_pool_ip6_netbits

Signed-off-by: Heiko Hund <heiko.hund@sophos.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1448470009-5243-1-git-send-email-heiko.hund@sophos.com>
URL: http://article.gmane.org/gmane.network.openvpn.devel/10613
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit a8f8b9267183c3cfc065f344d61effe6c55c3da6)