Run clang-format on the entire repo

This patch clang-formats the entire repo. Third-party code is
excluded.

I needed to fix up the .clang-format file so that all the header
includes are ordered properly. I could have sworn that it used to work
without the extra modification, but I guess not.

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: I64bb9f2c795401393f9dfe2fefc4f04cb36b52f6
diff --git a/tools/lint/run-ci.sh b/tools/lint/run-ci.sh
index 1f5fda4..c8d6501 100755
--- a/tools/lint/run-ci.sh
+++ b/tools/lint/run-ci.sh
@@ -114,7 +114,7 @@
 
 # All the linters that we are going to run.
 readonly -a LINTERS=(
-    #clang_format
+    clang_format
     gofmt
     gomod
     update_go_repos