Update git submodules
Update git submodules

* Update plugins/gitiles from branch 'master'
  to 37642627f0a4e6a3b2990ec754120b5055de6d41
  - Merge branch 'stable-3.0'
    
    * stable-3.0:
      Bazel: Fix lint warning flagged by buildifier
      Make transitive starlark loads explicit
      Make transitive starlark loads explicit
      Make transitive starlark loads explicit
    
    Change-Id: I1f1e3676385ed8d92c63b8947e67f0a0b39d3216
    
  - Merge branch 'stable-2.16' into stable-3.0
    
    * stable-2.16:
      Bazel: Fix lint warning flagged by buildifier
      Make transitive starlark loads explicit
      Make transitive starlark loads explicit
      Make transitive starlark loads explicit
    
    Change-Id: I3cf52e6bb276d7bfeaca95648de41f5f80f7d92b
    
  - Merge branch 'stable-2.15' into stable-2.16
    
    * stable-2.15:
      Bazel: Fix lint warning flagged by buildifier
    
    Change-Id: Ide139f43e915bf597a2faea0520b463422d15868
    
  - Merge branch 'stable-2.14' into stable-2.15
    
    * stable-2.14:
      Bazel: Fix lint warning flagged by buildifier
    
    Change-Id: I0720b94f6a655d13cfa695906b2fb8126ddcce1f
    
  - Bazel: Fix lint warning flagged by buildifier
    
    Buildifier warns about duplicate rule name gitiles:
    
    BUILD:24: duplicated-name: A rule with name "gitiles" was already found
    on line 4. Even if it's valid for Blaze, this may confuse other tools.
    Please rename it and use different names.
    
    Refactor the build and create gitiles-servlet resource jar in advance.
    In this case we do not need to create intermediate plugin artifact any
    more and can merge into the final artifact the gitiles-servlet resource
    archive.
    
    Change-Id: I58f7389725eb0fb1862fc35b4222f7757384d1dc
    
  - Merge branch 'stable-2.15' into stable-2.16
    
    * stable-2.15:
      Make transitive starlark loads explicit
      Make transitive starlark loads explicit
    
    Change-Id: I0b7ded82c7c82e1fece52302a1287f2160ac5a5e
    
  - Make transitive starlark loads explicit
    
    This fixes the build with bazel 0.25.
    
    Bug: Issue 10855
    Change-Id: I480b5a929a48ce327daf95d7f74e167e50aeed6d
    
  - Merge branch 'stable-2.14' into stable-2.15
    
    * stable-2.14:
      Make transitive starlark loads explicit
    
    Change-Id: I10f25501c0e2a41088b701318a6eeb0df2dec736
    
  - Make transitive starlark loads explicit
    
    This fixes the build with bazel 0.25.
    
    Bug: Issue 10855
    Change-Id: I480b5a929a48ce327daf95d7f74e167e50aeed6d
    
  - Make transitive starlark loads explicit
    
    This fixes the build with bazel 0.25.
    
    Bug: Issue 10855
    Change-Id: I480b5a929a48ce327daf95d7f74e167e50aeed6d
    
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