down-root plugin: Replaced system() calls with execve()

The system() call is prone to shell expansions and provides far more
environments variables to the executable run than what is usually
preferred.  By moving over to exevce() shell expansions are far more
difficult to achieve and only the OpenVPN provided environment
variables are available.

This is a response to the patch submitted to openvpn-devel ML:
http://article.gmane.org/gmane.network.openvpn.devel/7919

 v2 - Pulling it up again, fixing a few whitespace and spelling issues

Signed-off-by: David Sommerseth <davids@redhat.com>
Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <1416148262-20978-1-git-send-email-openvpn.list@topphemmelig.net>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9238
Signed-off-by: Gert Doering <gert@greenie.muc.de>
down-root: Improve error messages

If down-root fails it will now use warn() to provide some more information
about what went wrong, by retrieving the error message via errno.

Signed-off-by: David Sommerseth <davids@redhat.com>
Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <1416262460-9158-1-git-send-email-openvpn.list@topphemmelig.net>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9247
Signed-off-by: Gert Doering <gert@greenie.muc.de>