Update Information Environment Variables in OCP guide

Information Environment Variables section in EAP for OCP guide contains a non-existent environment variable:

mjurc@tigris  ~/Downloads  podman inspect registry.redhat.io/jboss-eap-7-tech-preview/eap-cd-openshift-rhel8 | grep JBOSS_IMAGE_NAME
"JBOSS_IMAGE_NAME=jboss-eap-7-tech-preview/eap-cd-openshift-rhel8",
mjurc@tigris  ~/Downloads  podman inspect registry.redhat.io/jboss-eap-7-tech-preview/eap-cd-openshift-rhel8 | grep JBOSS_IMAGE_VERSION
"JBOSS_IMAGE_VERSION=17.0"
mjurc@tigris  ~/Downloads  podman inspect registry.redhat.io/jboss-eap-7-tech-preview/eap-cd-openshift-rhel8 | grep JBOSS_MODULES_SYSTEM_PKG
"JBOSS_MODULES_SYSTEM_PKGS=org.jboss.logmanager,jdk.nashorn.api",
mjurc@tigris  ~/Downloads  podman inspect registry.redhat.io/jboss-eap-7-tech-preview/eap-cd-openshift-rhel8 | grep STI_BUILDER
✘ mjurc@tigris  ~/Downloads 

see https://issues.jboss.org/browse/EAP7-1161?focusedCommentId=13782285&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13782285