IBX-7653: IsContainer criterion added #1717

Job	Run time
Run code style check (8.0)	2m 39s
Solr integration tests (7.4)	9m 52s
Solr integration tests (8.0)	10m 20s
Unit tests & SQLite integration tests (7.4)	6m 40s
Solr integration tests (8.1)	9m 46s
Unit tests & SQLite integration tests (8.0)	6m 49s
Unit tests & SQLite integration tests (8.1)	6m 47s
PostgreSQL integration tests (7.4)	23m 46s
PostgreSQL integration tests (8.0)	19m 52s
MySQL integration tests (7.4)	14m 34s
PostgreSQL integration tests (8.1)	21m 9s
MySQL integration tests (8.0)	12m 42s
MySQL integration tests (8.1)	12m 45s
	2h 37m 41s

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