Remove unnecessary imports

...dolite/benchmarks/loadgenerator/HttpRecordSenderTest.java

...cks/theodolite/benchmarks/loadgenerator/KeySpaceTest.java

...ite/benchmarks/loadgenerator/LoadGeneratorTargetTest.java

...te/benchmarks/loadgenerator/TitanRecordGeneratorTest.java

...lite/benchmarks/loadgenerator/WorkloadDefinitionTest.java

...ite/benchmarks/uc4/kstreams/OptionalParentsSerdeTest.java

.../theodolite/benchmarks/uc4/kstreams/ParentsSerdeTest.java

...ite/benchmarks/uc4/kstreams/SensorParentKeySerdeTest.java