Update git submodules
Update git submodules

* Update plugins/cookbook-plugin from branch 'master'
  - Merge branch 'stable-2.13'
    
    * stable-2.13:
      HelloWebLink: Make the dummy image more visible
    
    Change-Id: I5291aabcf3c57f76fe17c65a770c09fe80022412
    
  - HelloWebLink: Make the dummy image more visible
    
    Change-Id: If2b80d5fd2f719ebd1db4c9b15f5c8e50f5cda3f
    
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