A implementation unit test for recovering log that has been damanged but salvagable.
To run, create a derby.properties file in a new directory with the
contents
derby.module.test.recoverBadLog=org.apache.derbyTesting.unitTests.store.T_RecoverBadLog
Execute in order
To Test Bad Log due to partial write that are identified by checking the
length in the beginning and end of the log record.