Dockerfile.debian9: updated list of dependency packages

docker/Dockerfile.debian9

@@ -29,6 +29,7 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install --assume-ye
   liblua5.1-0-dev \
   libmaxminddb-dev \
   libmemcached-dev \
+  libmnl-dev \
   libmongoc-dev \
   libmono-2.0-dev \
   libncurses5-dev \
@@ -52,6 +53,7 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install --assume-ye
   python \
   python-dev \
   python3-dev \
+  ruby-dev \
   unixodbc-dev \
   uuid-dev \
   xsltproc \