[TOREE-361] pinned docker image to version support Spark 2.x
[TOREE-361] pinned docker image to version support Spark 2.x

chipsenkbeil/incubator-toree,hmost1/incubator-toree,lresende/incubator-toree,hmost1/incubator-toree,apache/incubator-toree,apache/incubator-toree,chipsenkbeil/incubator-toree,apache/incubator-toree,lresende/incubator-toree,chipsenkbeil/incubator-toree,hmost1/incubator-toree,lresende/incubator-toree,hmost1/incubator-toree,chipsenkbeil/incubator-toree,lresende/incubator-toree