Do not clear sequence table when clearing database

[rmpestano]

JPA will have issues because it may have already pre-allocated sequence numbers:

Exception Description: Error preallocating sequence numbers.  The sequence table information is not complete.
    at org.eclipse.persistence.exceptions.DatabaseException.errorPreallocatingSequenceNumbers(DatabaseException.java:150)
    at org.eclipse.persistence.sequencing.StandardSequence.getGeneratedVector(StandardSequence.java:73)
    at org.eclipse.persistence.sequencing.DefaultSequence.getGeneratedVector(DefaultSequence.java:163)
    at org.eclipse.persistence.sequencing.Sequence.getGeneratedVector(Sequence.java:257)
    at org.eclipse.persistence.internal.sequencing.SequencingManager$Preallocation_Transaction_NoAccessor_State.getNextValue(SequencingManager.java:468)
    at org.eclipse.persistence.internal.sequencing.SequencingManager.getNextValue(SequencingManager.java:1067)
    at org.eclipse.persistence.internal.sequencing.ClientSessionSequencing.getNextValue(ClientSessionSequencing.java:70)
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.assignSequenceNumber(ObjectBuilder.java:361)
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.assignSequenceNumber(ObjectBuilder.java:320)
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.assignSequenceNumber(UnitOfWorkImpl.java:486)