[Bugs] #2157 UNSP: reimplement sugar.presence so it doesn't use the Presence Service

[Sugar Labs Bugs]

#2157: reimplement sugar.presence so it doesn't use the Presence Service
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    Reporter:  tomeu                      |          Owner:  erikos                     
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit              |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 As part of http://wiki.sugarlabs.org/go/Features/RemovePresenceService,
 activities need to be able to use collaboration without the Presence
 Service being present.

 This makes so without requiring activities to make any changes.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2157>
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