add additional packages needed by new tool

The new tool requires additional host tools for the script to run
correctly, so update the install list.

Story: 2006595
Task: 36831
Change-Id: Id49be9f28862dae33a5659cdfe2d1aac39c74540
Signed-off-by: Saul Wold <sgw@linux.intel.com>

Dockerfile

@@ -56,9 +56,11 @@ RUN groupadd -g 751 cgts && \
         createrepo \
         deltarpm \
         expat-devel \
+        isomd5sum \
         gcc \
         gettext \
         git \
+        libguestfs-tools \
         libtool \
         libxml2 \
         lighttpd \
@@ -93,6 +95,7 @@ RUN groupadd -g 751 cgts && \
         sudo \
         systemd \
         syslinux \
+        syslinux-utils \
         udisks2 \
         vim-enhanced \
         wget \