Update git submodules

* Update plugins/delete-project from branch 'master'
  to b81916e175fb485b504b01aa7bf7f3a8e4ff54d0
  - Merge branch 'stable-3.1'
    
    * stable-3.1:
      Format Java files with google-java-format
    
    Change-Id: I131e4e8b407fbb6dc2953380fcf3170974aeb87b
    
  - Merge branch 'stable-3.0' into stable-3.1
    
    * stable-3.0:
      Format Java files with google-java-format
    
    Change-Id: I2cf5df394af5b52a96f04ad529343c560f1698ef
    
  - Merge branch 'stable-2.16' into stable-3.0
    
    * stable-2.16:
      Format Java files with google-java-format
    
    Change-Id: Id16af3c4724919977b966b8869cbceed4c244f2e
    
  - Format Java files with google-java-format
    
    Change-Id: I48ab313d24fbf529a51899f8f5e0e2d3313f2519
    

plugins/delete-project

diff --git a/plugins/delete-project b/plugins/delete-project
index 041b055..b81916e 160000
--- a/plugins/delete-project
+++ b/plugins/delete-project
@@ -1 +1 @@
-Subproject commit 041b0559a8a68f51e0f34221e8d3903995b0cc9c
+Subproject commit b81916e175fb485b504b01aa7bf7f3a8e4ff54d0