[MERGE] devel-2.4 into master

[Michael Hanselmann]

commit 772102d463dbe4cc8a6f7f2aeead7cd072d10304
Merge: 580c971 29b8eae
Author: Michael Hanselmann <han...@google.com>
Date:   Fri Apr 29 14:56:50 2011 +0200

    Merge branch 'devel-2.4'
    
    * devel-2.4:
      TLReplaceDisks: Use implicit loop for dictionary
      Release unneeded locks while replacing disks
      locking: Export “list_owned” from lock manager
      gnt-instance: Fix typo in error message