Added parameter $status to bacula::filedaemon

This parameter allows removing most bacula::filedaemon configurations. This is
primarily useful when decommissioning a node as it prevents Bacula Director from
generating alerts about the decomissioned node (due to it's config file fragment
being still present). Even if $status is set to 'absent' some configurations
will be left behind - most notably those done in bacula::common. This change
will not affect existing configurations because by default $status is set to
'present'

Signed-off-by: Samuli Seppänen <samuli@openvpn.net>