This is a very weird situaiton. As far as I know the whole Red Hat distribution is still open source. Now they put themselves in a position to refrain from publishing their open source changes. If those changes do not flow up or down stream, how are they going to keep calling themselves open source? (They don't call themsegpes free software as far as I can tell)
Do you need screen, udhcpd to do so? Nope, but you get httpd, etc. It is just a choice they made to make it easy to host your application in a RHEL container on top of OpenShift running on RHEL (fully supportable stack)