[Bugs] #1787 UNSP: rebuild index on migration

[Sugar Labs Bugs]

#1787: rebuild index on migration
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    Reporter:  sascha_silbe               |          Owner:  sascha_silbe     
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.88             
   Component:  sugar-datastore            |        Version:  Git as of bugdate
    Severity:  Major                      |       Keywords:  r?               
Distribution:  Unspecified                |   Status_field:  Assigned         
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 Currently we force an index rescan on migration, but not a rebuild.  Any
 entry that's already in the index will ''not'' be updated.
 This patch fixes the migration logic to do a full index rebuild, thus
 actually migrating the index.

 This issue should cause the version 1 -> version 2 update not to happen,
 but I currently don't have any version 1 data to verify against. I noticed
 it because it affects version 2 (mainline) -> version 3 (version support
 branch) migrations.

 We'll probably want to backport this to 0.86 as well.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1787>
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