AQGRA-282: Functional testing using Graphene

* It is not inteded to be merged!
* It is just first version for review
* see JIRA comment:
https://issues.jboss.org/browse/ARQGRA-282?focusedCommentId=12793379&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-12793379
* Functional testing using Drone guide rewriten to Graphene