Fix to build quagga container image for cord-tester

Change-Id: Idb93512b20ab7f969f9b727ef4ad19fac429c366
diff --git a/Dockerfile.quagga b/Dockerfile.quagga
index e40cffa..9eed282 100644
--- a/Dockerfile.quagga
+++ b/Dockerfile.quagga
@@ -4,7 +4,7 @@
 RUN useradd -M quagga
 RUN mkdir /var/log/quagga && chown quagga:quagga /var/log/quagga
 RUN mkdir /var/run/quagga && chown quagga:quagga /var/run/quagga
-RUN apt-get update && apt-get install -qy git autoconf libtool gawk make telnet libreadline6-dev
+RUN apt-get update && apt-get install -qy git autoconf libtool gawk make telnet libreadline6-dev pkg-config protobuf-c-compiler
 RUN git clone git://git.savannah.nongnu.org/quagga.git quagga && \
 (cd quagga && git checkout HEAD && ./bootstrap.sh && \
 sed -i -r 's,htonl.*?\(INADDR_LOOPBACK\),inet_addr\("10.10.0.4"\),g' zebra/zebra_fpm.c && \