Add cpp tests under release docker image.
1. Added C++ tests under the release docker image.
2. Fixed a compile issue with the docker image.
3. Cleaned up tests.sh and removed traivis stuff.
diff --git a/autogen.sh b/autogen.sh
index 580714b..d00d217 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -28,6 +28,11 @@
set -ex
+# The absence of a m4 directory in googletest causes autoreconf to fail when
+# building under the CentOS docker image. It's a warning in regular build on
+# Ubuntu/gLinux as well.
+mkdir -p third_party/googletest/m4
+
# TODO(kenton): Remove the ",no-obsolete" part and fix the resulting warnings.
autoreconf -f -i -Wall,no-obsolete
