exception bash(and few plugins) of munin

[Ilya A. Arhipov]

Hi des@

Maybe exclude these plugins of Munin and bash:${PORTSDIR}/shells/bash of
Makefiles.
install bash, for these 5 plugins i think not correct, old version don't
have these plugins

grep -r "/usr/local/bin/bash" /usr/local/share/munin/plugins/
/usr/local/share/munin/plugins/colour_tester:#!/usr/local/bin/bash
/usr/local/share/munin/plugins/extinfo_tester:#!/usr/local/bin/bash
/usr/local/share/munin/plugins/fail2ban:#!/usr/local/bin/bash
/usr/local/share/munin/plugins/squeezebox_:#!/usr/local/bin/bash
/usr/local/share/munin/plugins/warning_tester:#!/usr/local/bin/bash

What do you think?