Update git submodules
Update git submodules

* Update plugins/singleusergroup from branch 'master'
  to ebb26f549e7b8d072739b31a6b6387fbb89c34f3
  - SingleUserGroup#suggest: Use Java 8 stream to transform list
    
    Change-Id: I1839f0f26cca5da622dbc6b8d79d8118219290a4
    
qtproject/qtqa-gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,WANdisco/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit