Bug#218514: base-config: should not allow sub mount points before parent mount points

[Elizabeth Barham <lizzy@soggytrousers.net>]

Package: base-config
Version: 1.33.18
Severity: normal

When creating the partitions and subsequent mount points, I specified
/usr/local prior to /usr. This caused /usr/local to be placed in fstab
prior to /usr which then clobbered /usr/local when /usr was mounted.

I'm suggesting that base-config notice that a sub-mount point has
been specified prior to its parent(s) and/or some kind of ordering
takes place prior to writing fstab.

-- System Information
Debian Release: 3.0
Architecture: i386
Kernel: Linux drwho 2.4.22-isa-only-386 #3 Thu Oct 9 19:59:37 CDT 2003 i486
Locale: LANG=C, LC_CTYPE=C

Versions of packages base-config depends on:
ii  adduser                    3.47          Add and remove users and groups
ii  apt                        0.5.4         Advanced front-end for dpkg
ii  bsdutils                   1:2.11n-4     Basic utilities from 4.4BSD-Lite.
ii  console-data               1999.08.29-24 Keymaps, fonts, charset maps, fall
ii  debconf                    1.0.32        Debian configuration management sy
ii  passwd                     20000902-12   Change and administer password and
ii  tasksel                    1.18          Tool for selecting tasks for insta