Update git submodules
Update git submodules

* Update plugins/gitiles from branch 'master'
  to dcd8d7f93ebe21e60688e65fa1261a836a82eb32
  - Merge branch 'stable-2.16'
    
    * stable-2.16:
      Upgrade bazlets to latest stable-2.16 to build with 2.16.7 API
      Upgrade bazlets to latest stable-2.15 to build with 2.15.12 API
      Upgrade bazlets to latest stable-2.14 to build with 2.14.19 API
    
    Change-Id: I1df79f175861e798f5db161579bf57f0a97a9fd4
    
  - Upgrade bazlets to latest stable-2.16 to build with 2.16.7 API
    
    Change-Id: I26f669b5881844d34a5dbdfe599bbb5c65247372
    
  - Merge branch 'stable-2.15' into stable-2.16
    
    * stable-2.15:
      Upgrade bazlets to latest stable-2.15 to build with 2.15.12 API
      Upgrade bazlets to latest stable-2.14 to build with 2.14.19 API
    
    Change-Id: I5f917a9e25cb7d918c8e2a5b41a0d1594075ad9e
    
  - Upgrade bazlets to latest stable-2.15 to build with 2.15.12 API
    
    Change-Id: I2d54e218283c32bf0b20d245db4601691f085815
    
  - Merge branch 'stable-2.14' into stable-2.15
    
    * stable-2.14:
      Upgrade bazlets to latest stable-2.14 to build with 2.14.19 API
    
    Change-Id: I2f5a0382e6fb4c43ceb428fbb4ad1977cbd63087
    
  - Upgrade bazlets to latest stable-2.14 to build with 2.14.19 API
    
    Change-Id: I04b6377966b4f00859ed685845916f16fdaa53df
    
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