[Hadoop Wiki] Update of "Roadmap" by MattFoley

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The "Roadmap" page has been changed by MattFoley:
http://wiki.apache.org/hadoop/Roadmap?action=diff&rev1=14&rev2=15

Comment:
Added material from Arun Murthy's email of Wed, Aug 3, 2011 at 2:02 PM PDT, to common-dev, clarifying Sustaining Releases process

  
  Release Manager: Owen O'Malley
  
- Because 0.21 had already been released, we added a new level to the release numbering. Thus version numbers on this branch look like 0.20.X.Y where X is > 200 and denotes the minor release from the branch. The Y denotes the patch release that is intended for critical bug fixes.
+ Because 0.21 had already been released, we added a new level to the release numbering. Thus version numbers on this branch look like 0.20.X.Y where X is > 200 and denotes the minor release from the branch. The Y denotes the point release that is intended for critical bug fixes to a previous sustaining release.
+ 
+ The Release Manager for a sustaining release should announce the code freeze date as far in advance as possible, on the general list.  Prior to that date, anyone interested in contributing to the release submits a patch to branch-0.20.security, and adds the sustaining release number to “Fix Version/s” in the Jira.  Only functionality already committed to trunk should be submitted to a sustaining release.  (The exception is if the functionality is not applicable to trunk.)  The Release Manager is fully responsible for release content and timelines.
+ 
+ After the code freeze date, the Release Manager will generate the release candidate and call a release vote in the usual way.  After that point, only patches for issues rated “blocker” may be added to the release.
  
  === 0.20.X.Y timeline ===