Long wait when 10.8 lang.SequenceGeneratorTest is run against 10.10 jars

Using the 10.8 testing jar and the 10.10 product jars the 10.8 test lang.SequenceGeneratorTest has multiple failures and then hangs after test_07_dropSequence fails.

To reproduce put the 10.8 derbyTesting.jar (latest on 10.8 branch) and 10.10.1.1 product jars in your classpath and run the junit test org.apache.derbyTesting.functionTests.tests.lang.SequenceGeneratorTest.

++ java -Xmx512M -Xms512M -Dderby.tests.debug=true -Dderby.tests.trace=true -Dderby.tests.basePort=1630 '-DderbyTesting.
oldReleasePath=C:\cygwin\svnreleases\jars' junit.textui.TestRunner org.apache.derbyTesting.functionTests.tests.lang.Sequ
enceGeneratorTest
++ tee rju.out
DEBUG:

basePort=1630, bogusPort=1631, jmxPort=1632
DEBUG:

basePort=1630, bogusPort=1631, jmxPort=1633
.
test_01_basic DEBUG: Preparing statement:
create sequence seq_01

DEBUG: Preparing statement:
select currentvalue from sys.syssequences seq, sys.sysschemas s where s.schemaname = ? and seq.sequencename = ?
and s.schemaid = seq.schemaid
DEBUG: Preparing statement:
values( next value for TEST_DBO.SEQ_01 )

DEBUG: Preparing statement:
select currentvalue from sys.syssequences seq, sys.sysschemas s where s.schemaname = ? and seq.sequencename = ?
and s.schemaid = seq.schemaid
used 723 ms F.
test_02_boundary used 323 ms E.
test_03_nonCycling used 315 ms E.
test_04_reboot DEBUG: Preparing statement:
create sequence seq_04

DEBUG: Preparing statement:
values( next value for TEST_DBO.SEQ_04 )

DEBUG: Preparing statement:
select currentvalue from sys.syssequences seq, sys.sysschemas s where s.schemaname = ? and seq.sequencename = ?
and s.schemaid = seq.schemaid
used 383 ms F.
test_05_concurrency DEBUG: Preparing statement:
create sequence seq_05

DEBUG: Preparing statement:
grant usage on sequence seq_05 to public

DEBUG: Preparing statement:
values( next value for TEST_DBO.SEQ_05 )

DEBUG: Preparing statement:
select currentvalue from sys.syssequences seq, sys.sysschemas s where s.schemaname = ? and seq.sequencename = ?
and s.schemaid = seq.schemaid
used 427 ms F.
test_06_bigStepSize used 306 ms E.
test_07_dropSequence DEBUG: Preparing statement:
create sequence seq_07

DEBUG: Preparing statement:
values( next value for TEST_DBO.SEQ_07 )

DEBUG: Preparing statement:
select currentvalue from sys.syssequences seq, sys.sysschemas s where s.schemaname = ? and seq.sequencename = ?
and s.schemaid = seq.schemaid
used 330 ms F