schemahcl: children (context) can refuse inheritance #985

Job	Run time
integration-maria102	1m 24s
integration-maria103	1m 21s
integration-maria107	1m 30s
integration-mysql56	1m 29s
integration-mysql57	1m 27s
integration-mysql8	1m 40s
integration-postgres10	1m 41s
integration-postgres-ext-postgis	1m 47s
integration-postgres11	1m 45s
integration-postgres12	1m 38s
integration-postgres13	1m 44s
integration-postgres14	1m 44s
integration-postgres15	1m 47s
integration-cockroach	1m 25s
integration-sqlite	1m 8s
integration-tidb5	1m 56s
integration-tidb6	1m 52s
	27m 18s

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