Update git submodules
Update git submodules

* Update plugins/gitiles from branch 'stable-3.0'
  to 4ba2cc4ea8d46e1e8050b46d62c654b8772b969a
  - Merge branch 'stable-2.16' into stable-3.0
    
    * stable-2.16:
      Bump Bazel version to 2.0.0
      Upgrade bazlets to latest stable-2.16 to build with 2.16.15 API
      Upgrade bazlets to latest stable-2.16 to build with 2.16.14 API
      Upgrade gitiles-servlet to 0.2-7.1
      Upgrade bazlets to latest stable-2.16 to build with 2.16.13 API
      Upgrade bazlets to latest stable-2.16
      Upgrade bazlets to latest stable-2.15 to build with 2.15.18 API
      Bazel: Migrate workspace status script to python
      Upgrade bazlets to latest stable-2.15
      Upgrade bazlets to latest stable-2.14
      Upgrade bazlets to latest stable-2.16
      Upgrade bazlets to latest stable-2.15
      Upgrade bazlets to latest stable-2.14
      Bump Bazel version to 1.1.0
      Replace bazel-genfiles with bazel-bin in documentation
    
    Change-Id: Ie23a1d582b74a918ecd7c08ce3ca3d39a8aaef31
    
  - Bump Bazel version to 2.0.0
    
    Change-Id: Ie7e432dcec730f513ec73b25a3e66a9f7e5d54cc
    
  - Upgrade bazlets to latest stable-2.16 to build with 2.16.15 API
    
    Change-Id: Iebd2bd6a692e1932fc51e1de2370774713a3c728
    
  - Upgrade bazlets to latest stable-2.16 to build with 2.16.14 API
    
    Change-Id: I5030ccd61b1376004735fd70316c582a541e7fb8
    
  - Upgrade gitiles-servlet to 0.2-7.1
    
    Version 0.2-7 is quite old and does not include fixes that have
    since been included in versions up to the latest 0.2-11 and on the
    stable-0.2 branch.
    
    In particular, [1] which was causing Gerrit JVM GC to start a series
    of 'stop-the-world' when rendering large files, has been fixed in the
    latest stable-0.2.
    
    We cannot upgrade directly to 0.2-11 because that also includes updates
    to JGit and soy which are not compatible with core Gerrit's 2.16 series.
    Hence, 0.2-7.1 has been released which includes all of the bug fixes
    and improvements, but not the library upgrades
    
    [1] https://github.com/google/gitiles/issues/192
    
    Change-Id: Iaad970f0400d14bd6c51fc1720aa12cc1b56c82a
    
  - Upgrade bazlets to latest stable-2.16 to build with 2.16.13 API
    
    Change-Id: I674f603537fa3295d458210efd7a213a0e70a277
    
  - Upgrade bazlets to latest stable-2.16
    
    download_file.py: Fix root workspace directory detection
    
    Change-Id: I26017fc180b761feba2b5f01d4eb7a0e7c7b690c
    
  - Merge branch 'stable-2.15' into stable-2.16
    
    * stable-2.15:
      Upgrade bazlets to latest stable-2.15 to build with 2.15.18 API
      Bazel: Migrate workspace status script to python
      Upgrade bazlets to latest stable-2.15
      Upgrade bazlets to latest stable-2.14
    
    Change-Id: I20bea00c6e9f0c40cab57ef174af7a4b8f638281
    
  - Upgrade bazlets to latest stable-2.15 to build with 2.15.18 API
    
    Change-Id: I502f5038ab5ed5e0ac2173ada6e9ee335a2297a6
    
  - Merge branch 'stable-2.14' into stable-2.15
    
    * stable-2.14:
      Bazel: Migrate workspace status script to python
    
    Change-Id: Ic4877ce81c885f1b36c96745b7b9ef8772522a61
    
  - Bazel: Migrate workspace status script to python
    
    Migrate tools/workspace-status.sh script to Python to ensure better
    compatibility with other operating systems, as suggested in: [1].
    
    [1] https://github.com/bazelbuild/bazel/issues/5958
    
    Change-Id: I20ec325d610353309a40fc85132382004bc61bd0
    
  - Merge branch 'stable-2.14' into stable-2.15
    
    * stable-2.14:
      Upgrade bazlets to latest stable-2.14
    
    Change-Id: Icde086c6cc20f2ee74a950577795ede98bad1025
    
  - Upgrade bazlets to latest stable-2.15
    
    download_file.py: Fix root workspace directory detection
    
    Change-Id: I1c5eb23dfe5978270c10ef6d2baaed7ecd0a04fc
    
  - Upgrade bazlets to latest stable-2.14
    
    download_file.py: Fix root workspace directory detection
    
    Change-Id: Id2da57a98ab0344dc9942d9ff0338309494b0f48
    
  - Upgrade bazlets to latest stable-2.16
    
    Fix genrule2 to clean up temporary folder content
    
    Change-Id: I1d186a2082b364f7acc2d99c20ec0211efebbfd2
    
  - Merge branch 'stable-2.15' into stable-2.16
    
    * stable-2.15:
      Upgrade bazlets to latest stable-2.15
      Upgrade bazlets to latest stable-2.14
      Bump Bazel version to 1.1.0
    
    Change-Id: I4fb2b40132673a4832740e0cda02f79c899ab1f5
    
  - Upgrade bazlets to latest stable-2.15
    
    Fix genrule2 to clean up temporary folder content
    
    Change-Id: I1d186a2082b364f7acc2d99c20ec0211efebbfd2
    
  - Merge branch 'stable-2.14' into stable-2.15
    
    * stable-2.14:
      Upgrade bazlets to latest stable-2.14
    
    Change-Id: I73b265cfbaeb4771f1ba08d8b66164f868a6a91c
    
  - Upgrade bazlets to latest stable-2.14
    
    Fix genrule2 to clean up temporary folder content
    
    Change-Id: I1d186a2082b364f7acc2d99c20ec0211efebbfd2
    
  - Merge branch 'stable-2.14' into stable-2.15
    
    * stable-2.14:
      Bump Bazel version to 1.1.0
    
    Change-Id: I2825624c55da0f5069fad70da2fa24b77130d8e7
    
  - Bump Bazel version to 1.1.0
    
    Change-Id: I4dcd50245de8a8793b1f826d14ffbd6176ef33ad
    
  - Merge branch 'stable-2.15' into stable-2.16
    
    * stable-2.15:
      Replace bazel-genfiles with bazel-bin in documentation
    
    Change-Id: I1496826af979861ef9391d113430379535a152e4
    
  - Merge branch 'stable-2.14' into stable-2.15
    
    * stable-2.14:
      Replace bazel-genfiles with bazel-bin in documentation
    
    Change-Id: I70ea61357ec662fa2e18325a437185d27bcd4f3d
    
  - Replace bazel-genfiles with bazel-bin in documentation
    
    Bug: Issue 11757
    Change-Id: I4bb7a8e5228123618dfa94aad1aea88a8198c2db
    
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