initscripts 1.0: mountall.sh: Drop dependency on util-linux-mount.

initscripts 1.0: mountall.sh: Drop dependency on util-linux-mount.
* Yes, there's such dependency, unspecified. Due to funky options it
doesn't work with cute busybox mount.
* Those funky options better be killed shamefully, but let's do the
twist, and allow to specify additional mountall options via
/etc/default/mountall, and let util-linix-mount spit its funkiness
there. User can edit it to his likes, too.