Do some file/directory tests before really starting openvpn

OpenVPN can handle over 30 different files and directories, and it is easy
to misconfigure some of them.  In many situations OpenVPN will even start
running, even with a wrong file path or without the proper permissions, and
then it will complain much later on.  In some cases the error being seen at
this late point might even be difficult to relate to a configuration option.

This patch tries to catch as many of these files as soon as possible, kind of
to "smoke-test" the files and directories to avoid the most likely errors.

Trac-ticket: 73
Signed-off-by: David Sommerseth <davids@redhat.com>
Acked-by: Gert Doering <gert@greenie.muc.de>

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