Update git submodules
Update git submodules

* Update plugins/singleusergroup from branch 'master'
  to 0f798f61c0c598c1499cbaacc1c609078c8bf0d5
  - Merge branch 'stable-2.15'
    
    * stable-2.15:
      Bazel: Reformat BUILD file with buildifier 0.17.2
    
    Change-Id: I35086c7360d0fb3f80b20397eda39733b2701adb
    
  - Bazel: Reformat BUILD file with buildifier 0.17.2
    
    Change-Id: I0aac4a7b965b5bce69e8a5370f11d0dda4b27667
    
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