tests: enable client authentication in bogo

_dev/bogo/Dockerfile

@@ -23,7 +23,10 @@ RUN git clone https://github.com/henrydcase/crypto-tls-bogo-shim \
 # ARG REVISION=f9729b5e4eafb1f1d313949388c3c2b167e84734
 
 # Draft 23
-ARG REVISION=d07b9e80a87c871c2569ce4aabd06695336c5dc5
+#ARG REVISION=d07b9e80a87c871c2569ce4aabd06695336c5dc5
+
+# Draft 23 (+ client authentication)
+ARG REVISION=cd33ad248ae9490854f0077ca046b47cac3735bf
 
 RUN cd /go/src/github.com/henrydcase/crypto-tls-bogo-shim && \
     git checkout $REVISION