return to previous query9 api implementation
Merge branch '2.0-maint' into 2.1-maint
Merge branch '2.1-maint'

Conflicts:
	data-import/src/main/java/com/ldbc/snb/interactive/neo4j/interactive/embedded_api_steps/Neo4jQuery9EmbeddedApi.java
remove old query9 api impl
Merge branch '2.0-maint' into 2.1-maint
Merge branch '2.1-maint'
Merge branch 'master' of github.com:ldbc-dev/ldbc_snb_workload_interactive_neo4j