Move res_init() call to inner openvpn_getaddrinfo() loop

Move res_init() call to inner openvpn_getaddrinfo() loop

A non-working nameserver in /etc/resolv.conf could lead to endless
loops inside openvpn_getaddrinfo(), because many systems will only
pick up changes to resolv.conf if res_init() is called again.

To reproduce, run openvpn with --resolv-retry infinite (2.3) or
--resolv-retry "a high number" (master) on a BSD system.  Linux
glibc seems to stat() resolv.conf on calls to getaddrinfo() and
pick up changes automatically.

Trac #523

Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <1433080749-6892-1-git-send-email-gert@greenie.muc.de>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9763
(cherry picked from commit 288a819af7d3a6fab9e0b69ae8dbaac74b36307b)