message: ci: add wireshark/tshark to Ubuntu CI image.
  This will be used for testing utilities such as capture2pcap in CI.
diff: @@ -4,8 +4,9 @@ set -e
  # Setup basic requirements and install them.
  apt-get update
  +export DEBIAN_FRONTEND=noninteractive
  apt-get install -y wget software-properties-common make cmake git python python-pip \
  - bc libtool automake zip time golang g++ gdb strace
  + bc libtool automake zip time golang g++ gdb strace wireshark tshark
  # clang head (currently 5.0)
  wget -O - http://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
  apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-5.0 main"
  