Revamped the script-security warning logging (version 2)

The main task of this patch is to avoid reporting the SCRIPT_SECURITY_WARNING
over and over again, in addition to not show this warning when it should not
be a problem.  This general warning should now only appear once, and only when
--script-security is not set, 0 or 1.  In all other cases this warning should
not appear.

In addition, this warning will come close to the script-hook which most probably
will fail.  It will also give a little bit more concrete hint on which script-hook
which failed.  If --script-security is 2 or 3, only the execve failure itself will
be shown.  This message will on the other hand be shown repeatedly.

This is a new rewritten version which simplifies the implementaion of the new
openvpn_run_script() function.  It was considered to remove it completely, but
due to code clearity and easy of use it was decided to make this function a static
inline function instead.  Anyhow, this function will enforce openvpn_execve_check()
to be called with the S_SCRIPT flag.

Patch ACKed on the developers meeting 2009-04-29.

Signed-off-by: David Sommerseth <dazo@users.sourceforge.net>
Acked-by: James Yonan <james@openvpn.net>

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