[Bugs] #3824 Rainbow UNSP: rainbow-gc doesn't clean up groups

[Sugar Labs Bugs]

#3824: rainbow-gc doesn't clean up groups
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    Reporter:  sascha_silbe               |          Owner:  sascha_silbe               
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Rainbow                    |        Version:  Git as of bugdate          
    Severity:  Major                      |       Keywords:                             
Distribution:                             |   Status_field:  New                        
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 {{{rainbow-gc}}} only removes unused users, but not groups. The
 accumulated cruft of several months of Rainbow usage now causes {{{sudo}}}
 (which apparently iterates over all groups of the originating and target
 users) and {{{id}}} to take > 10s on my desktop (Athlon X2 Dual Core
 BE-2300).

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3824>
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