samhain: update to 3.1.2

Signed-off-by: Armin Kuster <akuster808@gmail.com>
checksecurity: update to version 2.0.15

update fixed:
 * Fix bug in the CS_NFSAFS definition in etc/check-setuid.conf that prevents
   the script from matching any filesystem. This bug was, actually, making the
   script not do anything in the default configuration.

Signed-off-by: Armin Kuster <akuster808@gmail.com>