Add Option --disable-bbu-monitoring to disable MegaCli BBU Monitoring

As the new MegaCli BBU Monitoring breakes monitoring on our servers (unreliable, IBM x3650 M3 / x3690 X5), we need a way to disable this option. Using an older version of check_raid.pl is not an option, as we need some mpt-status fixes :(

However, a general way to allow specifying module/plugin options would be great, I opened ticket / request for this.