#2904 NORM Trial-3: need datastore.exists(datastoreId) method

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#2904: need datastore.exists(datastoreId) method
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 Reporter:  erikb      |       Owner:  bcsaller
     Type:  defect     |      Status:  new     
 Priority:  normal     |   Milestone:  Trial-3 
Component:  datastore  |     Version:          
 Keywords:             |    Verified:  0       
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 Need way to check if a datastoreObject exists or not.

 Current workaround is to get(datastoreId) and see if we get an error or
 not.

 Use case: someone takes a photo, then deletes it from the journal later,
 then the camera activity needs to know the photo it is expecting isn't
 there.

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Ticket URL: <https://dev.laptop.org/ticket/2904>
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