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
    
diff --git a/plugins/singleusergroup b/plugins/singleusergroup
index cc636d7..0f798f6 160000
--- a/plugins/singleusergroup
+++ b/plugins/singleusergroup
@@ -1 +1 @@
-Subproject commit cc636d7e36afb62455a9f045b125d246fd84afd0
+Subproject commit 0f798f61c0c598c1499cbaacc1c609078c8bf0d5