Merge pull request #2 from bparees/config_override

add env var to prevent config overriding
BZ 1078787 - added env var to disable openshift managed server
Updated README for generated passwords, added screencap
updated README and added installation users screencap
Correct handling of env variable substitution into standalone.xml

https://bugzilla.redhat.com/show_bug.cgi?id=1080024