Fix TestAclProcessingExceedingTimeout on Nuxeo 6.0 with Java 8

java.lang.AssertionError: invoke on features error [org.nuxeo.ecm.platform.test.PlatformFeature@7ff2a664, org.nuxeo.ecm.directory.sql.SQLDirectoryFeature@6a472554, org.nuxeo.ecm.platform.login.test.ClientLoginFeature@3d36e4cd, org.nuxeo.ecm.core.test.CoreFeature@709ba3fb, org.nuxeo.ecm.core.test.TransactionalFeature@5d20e46, org.nuxeo.runtime.test.runner.RuntimeFeature@7364985f]
	at org.nuxeo.runtime.test.runner.FeaturesRunner.invokeFeatures(FeaturesRunner.java:468)
	at org.nuxeo.runtime.test.runner.FeaturesRunner.afterTeardown(FeaturesRunner.java:302)
	Suppressed: org.nuxeo.ecm.directory.DirectoryException: error remove links to Administrator
		at org.nuxeo.ecm.directory.sql.TableReference.removeLinksFor(TableReference.java:315)
		at org.nuxeo.ecm.directory.sql.TableReference.removeLinksForSource(TableReference.java:329)
		at org.nuxeo.ecm.directory.sql.SQLSession.deleteEntry(SQLSession.java:637)
		at org.nuxeo.ecm.directory.sql.SQLDirectoryFeature.afterTeardown(SQLDirectoryFeature.java:140)
		at org.nuxeo.runtime.test.runner.FeaturesRunner$9.call(FeaturesRunner.java:306)
		at org.nuxeo.runtime.test.runner.FeaturesRunner.invokeFeatures(FeaturesRunner.java:472)
		... 16 more
	Caused by: org.h2.jdbc.JdbcSQLException: Table "user2group" not found; SQL statement:
DELETE FROM "user2group" WHERE "userId" = ? [42102-177]
		at org.h2.message.DbException.getJdbcSQLException(DbException.java:344)
		at org.h2.message.DbException.get(DbException.java:178)
		at org.h2.message.DbException.get(DbException.java:154)
		at org.h2.command.Parser.readTableOrView(Parser.java:5213)
		at org.h2.command.Parser.readTableOrView(Parser.java:5190)
		at org.h2.command.Parser.readSimpleTableFilter(Parser.java:758)
		at org.h2.command.Parser.parseDelete(Parser.java:781)
		at org.h2.command.Parser.parsePrepared(Parser.java:363)
		at org.h2.command.Parser.parse(Parser.java:306)
		at org.h2.command.Parser.parse(Parser.java:278)
		at org.h2.command.Parser.prepareCommand(Parser.java:243)
		at org.h2.engine.Session.prepareLocal(Session.java:442)
		at org.h2.engine.Session.prepareCommand(Session.java:384)
		at org.h2.jdbc.JdbcConnection.prepareCommand(JdbcConnection.java:1188)
		at org.h2.jdbc.JdbcPreparedStatement.<init>(JdbcPreparedStatement.java:73)
		at org.h2.jdbc.JdbcConnection.prepareStatement(JdbcConnection.java:276)
		at org.nuxeo.ecm.directory.sql.TableReference.removeLinksFor(TableReference.java:311)
		... 21 more