* StartEventTest stabilisation

* history clearing error log changed

* comment updated

* JBPM-6487 Assertions.assertThat replaced by assertThatExceptionOfType

* JBPM-6487 unused import removed

RHBPMS-5042 - Signal fails with 'Could not find process instance with id' when the Audit mode is NONE (#1050)

* AsyncAuditLogProducerTest test fixed

* AsyncAuditLogProducerTest test fixed

* Using of junit methods replaced by assertj

* latch is used to countdown until all the messages in the queue are processed

* TaskCommentTest.testTaskCommentsOrder stabilisation

* CompensationTest.specificCompensationOfASubProcess fixed when comparing empty values

* AbstractAuditLogServiceTest.runTestLogger4LargeVariable test fixed

* TaskCommentTest.testTaskComment fixed when comparing comments date

* IntermediateEventTest.testTimerBoundaryEventInterruptingOnTaskCancelTimer empty timers assert fixed

* TaskExpirationDateTest.testExpirationDate fixed when comparing dates

* AsyncAuditLogProducerTest.testAsyncAuditLoggerCompleteWithVariablesCustomIndexer: null and empty values comparing fixed

* Pull request issues fixed

* unused imports removed

RHBPMS-4994 - org.drools.core.WorkItemHandlerNotFoundException doesn't generate an execution error (#1025)

* AsyncAuditLogProducerTest.testAsyncAuditLoggerCompleteWithVariablesCustomIndexer fixed when comparing process variable values loaded from audit log. Sometimes variable values were retrieved from audit log in wrong order

* audit log clering added for CommandBasedAuditLogServiceTest

* merge issue fixed in CommandBasedAuditLogServiceTest

* Revert "merge issue fixed in CommandBasedAuditLogServiceTest"

This reverts commit 16fc8e3559d6a56c6e3b3a3a0e1d15d8c523590a.

* TaskCommentTest.testTaskComment test fixed when comparing comments date

RHBPMS-4942 - LazyInitializationException when getting process variables which extends VariableEntity (#1019)

JBPM-6463 - Clustered EJB timers start duplicated process instances when used inside startEvent (#1022)