Auto merge of #2939 - bstaletic:ycmd_update, r=micbou

[READY] ycmd update

# PR Prelude

Thank you for working on YCM! :)

**Please complete these steps and check these boxes (by putting an `x` inside
the brackets) _before_ filing your PR:**

- [x] I have read and understood YCM's [CONTRIBUTING][cont] document.
- [x] I have read and understood YCM's [CODE_OF_CONDUCT][code] document.
- [x] I have included tests for the changes in my PR. If not, I have included a
  rationale for why I haven't.
- [x] **I understand my PR may be closed if it becomes obvious I didn't
  actually perform all of these steps.**

# Why this change is necessary and useful

- Valloric/ycmd#949 - update-clang
- Valloric/ycmd#948 - sitecustomize-import-failure
- Valloric/ycmd#922 - alt-translation-unit
- Valloric/ycmd#946 - java-upgrade
- Valloric/ycmd#945 - skip-build
- Valloric/ycmd#939 - drop-vagrant-setup
- Valloric/ycmd#941 - update-clang-script
- Valloric/ycmd#940 - lower-minimum-python-version-requirements
- Valloric/ycmd#938 - stray-windows-paths
- Valloric/ycmd#936 - clang-cl_support
- Valloric/ycmd#934 - run-tests-fix-removing-cfamily
- Valloric/ycmd#933 - java-completer-server-is-running
- Valloric/ycmd#932 - java-completer-stderr
- Valloric/ycmd#931 - server-file-state
- Valloric/ycmd#929 - fix-cs-instructions
- Valloric/ycmd#926 - code-actions-offset
- Valloric/ycmd#924 - quiet-build

<!--[Please explain **in detail** why the changes in this PR are needed.]

[cont]: https://github.com/Valloric/YouCompleteMe/blob/master/CONTRIBUTING.md
[code]: https://github.com/Valloric/YouCompleteMe/blob/master/CODE_OF_CONDUCT.md

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third_party/ycmd

@@ -1 +1 @@
-Subproject commit 9c9ef18dc6096e4ab434cd4d3937dea3411ff7c2
+Subproject commit b8ccbbfa9c68298692c05e73c2e44ca8e1ddc5d5