adding the platform mode

Signed-off-by: Jeremy Mordkoff <jeremy.mordkoff@gmail.com>

jenkins/SO/install

@@ -94,7 +94,7 @@ apt-get update
 # and install the tools
 apt remove -y rw.toolchain-rwbase tcpdump
 apt-get install -y --allow-downgrades rw.tools-container-tools=${PLATFORM_VERSION} rw.tools-scripts=${PLATFORM_VERSION} python
-/usr/rift/container_tools/mkcontainer --modes MANO-base --rw-version ${PLATFORM_VERSION}
+/usr/rift/container_tools/mkcontainer --modes MANO-base,rw-platform --rw-version ${PLATFORM_VERSION}
 
 # now disable the RIFT OSM repo so that we'll get MANO from
 # the OSM repos