Squashed commit of the following:

commit 551e98c44d5f0d3b5f23b33d96065ef88e695730
Author: Jonathan Vercoutre <jonathan.vercoutre@isvtec.com>
Date:   Wed Mar 26 14:29:21 2014 +0100

    * check_nagios_log: changed shell (bash) and put some bash parameters

commit 0d20e1e25213c4fea97e1e4fd0572b500175c9f0
Author: Jonathan Vercoutre <jonathan.vercoutre@isvtec.com>
Date:   Wed Mar 26 14:28:31 2014 +0100

    * check_nagios_livestatus: changed shell (bash) and put some bash
    options
Revert "Squashed commit of the following:"

This reverts commit 1d813e631d53870d19585a8211ec9f4fd5b63805.