BIND 10 trac945, created. b5dc1d86b2a763f98d8414589a545fcbda09a36c [trac945] fix some config_update() problems

[BIND 10 source code commits]

The branch, trac945 has been created
        at  b5dc1d86b2a763f98d8414589a545fcbda09a36c (commit)

- Log -----------------------------------------------------------------
commit b5dc1d86b2a763f98d8414589a545fcbda09a36c
Author: Jelte Jansen <jelte at isc.org>
Date:   Thu May 19 18:25:04 2011 +0200

    [trac945] fix some config_update() problems
    
    - fixes the uninitialized problem
    - does not set values to None if they are not updated while others are
    - restores previous config if there is an error in the new one
    (+tests)
    
    Also added a few TODO's, which are needed, but not as urgently as these (eg take defaults from spec, which would require more changes than i want to do right now, as does making a separate class for storing these values so they don't all have to be backed up when applying a new config)

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