docker: Add two more dependencies to the fedora builder

Strictly speaking not needed for the build and test, but if we want to use the
image also for packaging this is required.

Signed-off-by: Christian Decker <decker.christian@gmail.com>

contrib/Dockerfile.builder.fedora

@@ -15,9 +15,11 @@ RUN dnf update -y && \
 		python3-devel \
 		python3-pip \
 		python3-setuptools \
+		redhat-lsb \
 		net-tools \
 		valgrind \
 		wget \
+		xz \
 		zlib-devel && \
 	dnf clean all