[Bugs] #1201 UNSP: preserve uid property in sugar.datastore.find()

[SugarLabs Bugs]

#1201: preserve uid property in sugar.datastore.find()
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    Reporter:  sascha_silbe               |          Owner:  tomeu            
        Type:  task                       |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86             
   Component:  sugar-datastore            |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:  r?               
Distribution:  Unspecified                |   Status_field:  New              
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 Except for find() all functions in sugar.datastore.datastore preserve the
 'uid' property in the metadata; write() even sets it on create().
 This patch (on top of #1197) stops find() from removing that property so
 that it's now consistently set regardless of which function inside
 sugar.datastore.datastore created the DSObject / DSMetadata (find(),
 get(), write(); get_properties() from #1197).

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Ticket URL: <http://dev.sugarlabs.org/ticket/1201>
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