Update git submodules

* Update plugins/singleusergroup from branch 'stable-3.2'
  to b594c7f7d6ed77317fa7602dc5d6ff354899bb78
  - Merge branch 'stable-3.1' into stable-3.2
    
    * stable-3.1:
      Fix the junit test tag
    
    Change-Id: Idc4c07fba8786f0a0eea63c51a39063fdbe76f31
    
  - Fix the junit test tag
    
    Change-Id: I4c75cad99654d52968f62f535edf6c8732e37548
    
diff --git a/plugins/singleusergroup b/plugins/singleusergroup
index d04c4c3..b594c7f 160000
--- a/plugins/singleusergroup
+++ b/plugins/singleusergroup
@@ -1 +1 @@
-Subproject commit d04c4c33ad36e2e11ccc8b798357dd1e4e979a1a
+Subproject commit b594c7f7d6ed77317fa7602dc5d6ff354899bb78