Use Ubuntu minimal image as advanced guest image

Ubuntu minimal is smaller than regular cloud image.
It should works fine with less memory and boot faster than in
the gates.

Change-Id: Ie281698ecef05fd7ddf831eabd0e0121ac477709
diff --git a/tools/customize_ubuntu_image b/tools/customize_ubuntu_image
index 3697265..fdd2d12 100755
--- a/tools/customize_ubuntu_image
+++ b/tools/customize_ubuntu_image
@@ -16,6 +16,13 @@
 INSTALL_GUEST_PACKAGES=(
    socat  # used to replace nc for testing advanced network features like
           # multicast
+   iperf3
+   iputils-ping
+   ncat
+   psmisc  # provides killall command
+   python3
+   tcpdump
+   vlan
 )
 
 # Function to be executed once after chroot on guest image
@@ -33,8 +40,8 @@
     # Install desired packages to Ubuntu guest image
     (
         DEBIAN_FRONTEND=noninteractive
-        apt-get update -y
-        apt-get install -y "${INSTALL_GUEST_PACKAGES[@]}"
+        sudo apt-get update -y
+        sudo apt-get install -y "${INSTALL_GUEST_PACKAGES[@]}"
     )
 }