Update git submodules
Update git submodules

* Update plugins/plugin-manager from branch 'master'
  to 833889d327a159b5ccea7064f4fcff3f94d4b26e
  - Adapt to changed REST interfaces in Gerrit core
    
    Signed-off-by: Edwin Kempin <ekempin@google.com>
    Change-Id: I1d05880cbfd723f517460e43722ad128992acce1
    
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