fix(engine): RuntimeService.getActivityInstance from nested command

make sure that RuntimeService.getActivityInstance() takes into account
current DbSqlSession cache.

Fixes Stack overflow in case sql session cache and db state differ
structurally.

related #CAM-2169
chore(engine): break after executions are found

related to #CAM-2169
fix(ldap): use memberId instead of full DN with posix groups

related to #CAM-2281
feat(cmmn): deploy a CMMN 1.0 Xml to the engine

This commit adds the feature to deploy a CMMN 1.0 XML to the engine.

Furthermore this commit provide a new structure how to transform a CMMN
1.0 XML into an engine executable model. Therefore this commit adds the
following subjects:

- handler for each CMMN Element
- transformer to walk through the Cmmn Model

related to CAM-2199
feat(caseDefinitionQuery): Expose CaseDefinitionQuery via Rest API

related to CAM-2199
fix(qa/jboss): fix domain mode test