[Buildbot] #3511: LdapUserInfo: make group features optional

[Buildbot trac]

#3511: LdapUserInfo: make group features optional
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Reporter:  gracinet     |       Owner:
    Type:  enhancement  |      Status:  new
Priority:  major        |   Milestone:  undecided
 Version:  0.8.12       |  Resolution:
Keywords:               |
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Comment (by gracinet):

 Submitted as https://github.com/buildbot/buildbot/pull/2192

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Ticket URL: <http://trac.buildbot.net/ticket/3511#comment:1>
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