Refactor tests for clarity and maintainability #5611

Job	Run time
build-all	3m 20s
tests (hbase, -Dtest="*/graphdb/hbase/", hbase2-graphdb-java8, 8)	52m 2s
tests (hbase, -Dtest="*/hadoop/", hbase2-hadoop-java8, 8)	28m 51s
tests (hbase, -Dtest="*/diskstorage/hbase/", hbase2-diskstorage-java8, 8)	46m 53s
tests (hbase, -Pjava-11, -Dtest="*/hadoop/", hbase2-hadoop, 11)	42m 29s
tests (hbase, -Pjava-11, -Dtest="*/graphdb/hbase/", hbase2-graphdb, 11)	54m 19s
tests (hbase, -Pjava-11, -Dtest="*/diskstorage/hbase/", hbase2-diskstorage, 11)	40m 34s
	4h 28m 28s

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