docs: cleanup TODO

Signed-off-by: Karel Zak <kzak@redhat.com>

Documentation/TODO

@@ -1,22 +1,11 @@
 
  Note that items with (!) have high priority.
 
-su
---
- - log all attempts to lastlog if authentication by
-   password is required (pam_authenticate()).  See login.c for more details.
-   https://bugzilla.redhat.com/show_bug.cgi?id=866682
-
 lscpu
 -----
   - detect more hypervisors, see 'virt-what' shell script
     http://people.redhat.com/~rjones/virt-what/
 
-dmesg
------
-
- - add --color to colorize err and panic messages
-
 minix (fsck, mkfs)
 ------------------
 
@@ -59,13 +48,6 @@ libmount (mount/umount)
    translate the device name to backing file and then search in mtab for the 
    filename. See loopdev_get_loopfile().
 
- - add ---target-prefix option to specify prefix for mountpoints
-   so then you can
-
-	mount --fstab=/etc/fstab.sandbox -a --target-prefix=/mnt/sandbox
-
-   to create a new hierarchy of filesystems at sandbox
-
 libblkd and libmount
 --------------------
 
@@ -148,61 +130,14 @@ fdisk(s)
 misc
 ----
 
- - switch_root:
-     - move all mountpoints to the newroot (there are hardcoded /proc /sys and /dev paths now)
-     - add --dont-move[=<list of dirs>] options
-
- - use TZ=UTC
-
  - add mllockall() and SCHED_FIFO to hwclock,
    see http://lkml.org/lkml/2008/10/12/132
  
- - (!) rewrite ipcs to use /proc/sys/kernel rather than unreliable syscalls
-   (there are problems with 32bit userspace on 64bit kernel)
-
 
 ---------------
 exotic requests
 ---------------
 
- - mount -a -- reorder fstab entries by paths before mount (just idea only)
-
- - mount -a  (just idea only)
-
-        Date:   Sun, 3 Jun 2007 18:04:24 +0300 (MET DST)
-        From: Szabolcs Szakacsits <szaka@sienet.hu>
-
-	In the past the right record order could be figured out easily by just
-	checking out fstab (if one knew what to look for) but considering the
-	fastly increasing number of user space file systems and their usage, with
-	their path, library, etc dependencies, it's getting trickier and is a black
-	magic for most users because they simply expect drives to be mounted
-	independently of their order in fstab.
-
-	One typical, wrongly edited fstab example is:
-
-	  /dev/hda2 /             ext3      defaults  1 1
-	  /dev/hda1 /mnt/windows  ntfs-3g   defaults  0 0
-	  /dev/hda3 /usr          ext3      defaults  0 0
-
-	The events:
-
-	  mount  ->  /sbin/mount.ntfs-3g  ->
-		 ->  resolves to <path1>/ntfs-3g via a symlink ->
-		 ->  ntfs-3g requires at least <path2>/libfuse*
-
-	There are many potential solutions. For example installing everything on
-	the root file system which may be needed for successful mount. But this
-	is not always feasible or practical since we could end up putting almost
-	everything on the root file system in the end.
-
-	Another idea is an improved mount strategy:
-
-	  do {
-		try to mount all unmounted entries
-	  } while (not all mounted && at least one new was successfully mounted)
-
-
  - add SELinux security contexts support to the 'ipcs' utility
    http://bugzilla.redhat.com/show_bug.cgi?id=225342