Tests for sql directories should init correctly

org.nuxeo.ecm.directory.DirectoryException: org.postgresql.util.PSQLException: Cannot commit when autoCommit is enabled.
	at org.nuxeo.ecm.directory.sql.SQLDirectory.<init>(SQLDirectory.java:230)
	at org.nuxeo.ecm.directory.sql.SQLDirectoryProxy.getDirectory(SQLDirectoryProxy.java:50)
	at org.nuxeo.ecm.directory.sql.SQLDirectoryTestCase.getDirectory(SQLDirectoryTestCase.java:70)
	at org.nuxeo.ecm.directory.sql.TestSessionsAreClosedAutomatically.fetchUserDirectory(TestSessionsAreClosedAutomatically.java:84)
	...
Caused by: org.postgresql.util.PSQLException: Cannot commit when autoCommit is enabled.
	at org.postgresql.jdbc2.AbstractJdbc2Connection.commit(AbstractJdbc2Connection.java:813)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.nuxeo.runtime.api.ConnectionHelper$ConnectionHandle.invoke(ConnectionHelper.java:233)
	at com.sun.proxy.$Proxy30.commit(Unknown Source)
	at org.nuxeo.ecm.directory.sql.SQLDirectory.<init>(SQLDirectory.java:227)
	... 33 more