Enable clang-tidy as a sanity check, fix up all known failures
diff --git a/.clang_complete b/.clang_complete
index 4c4a86f..aa77554 100644
--- a/.clang_complete
+++ b/.clang_complete
@@ -10,3 +10,8 @@
 -Ithird_party/zlib
 -Ithird_party/protobuf/src
 -Ithird_party/abseil-cpp
+-Ithird_party/cares/cares
+-Ithird_party/cares
+-Ithird_party/googletest/googletest/include
+-Ithird_party/googletest/googlemock/include
+