[JBIDE-25821] Automate building of Nexus instance - Red Hat Issue Tracker

Git Pull Request:
https://gitlab.mw.lab.eng.bos.redhat.com/dev-platform/mwqa-cloud-slaves/merge_requests/112, https://gitlab.mw.lab.eng.bos.redhat.com/dev-platform/mwqa-env-suite/merge_requests/13, https://gitlab.mw.lab.eng.bos.redhat.com/dev-platform/mwqa-cloud-slaves/merge_requests/119

There is Nexus server named 'rhel-nexus' running on openstack [1]. It has been made by hand, but the creation process should be automated.