Changed base docker image to be from rhscl/nodejs-4-rhel7.
Changed base docker image to be from rhscl/nodejs-4-rhel7.

Note: Went from Node version 6 to Node version 4.

EnMasseProject/enmasse,EnMasseProject/enmasse,jenmalloy/enmasse,EnMasseProject/enmasse,EnMasseProject/enmasse,jenmalloy/enmasse,jenmalloy/enmasse,jenmalloy/enmasse,EnMasseProject/enmasse,EnMasseProject/enmasse,jenmalloy/enmasse,jenmalloy/enmasse,EnMasseProject/enmasse,jenmalloy/enmasse