Fix docs typo: `post_install` script references
Fix docs: `setup' script is optional, not mandatory
Document Cartridge Installation Process
Merge pull request #5536 from VojtechVitek/docs_setup_install_order

Merged by openshift-bot
WIP Node Platform - Add reference_id and container_uuid to New Relic report

* Unit tests for MCo Openshift agent
Automatic commit of package [openshift-origin-cartridge-phpmyadmin] release [1.23.1-1].
Automatic commit of package [openshift-origin-cartridge-jenkins-client] release [1.23.1-1].
Automatic commit of package [rubygem-openshift-origin-node] release [1.27.1-1].
Automatic commit of package [openshift-origin-cartridge-jbossews] release [1.26.1-1].
Automatic commit of package [openshift-origin-cartridge-postgresql] release [1.27.1-1].
Automatic commit of package [rubygem-openshift-origin-admin-console] release [1.23.1-1].
Automatic commit of package [openshift-origin-cartridge-mysql] release [1.26.1-1].
Automatic commit of package [rubygem-openshift-origin-container-selinux] release [0.10.1-1].
Automatic commit of package [openshift-origin-msg-node-mcollective] release [1.24.1-1].
Automatic commit of package [openshift-origin-cartridge-php] release [1.27.1-1].
Automatic commit of package [openshift-origin-cartridge-python] release [1.27.1-1].
Automatic commit of package [rubygem-openshift-origin-controller] release [1.27.1-1].
Automatic commit of package [rubygem-openshift-origin-console] release [1.27.1-1].
Automatic commit of package [openshift-origin-node-proxy] release [1.25.1-1].
Automatic commit of package [openshift-origin-cartridge-dependencies] release [1.26.1-1].