fixed test suite failing

src/test/java/org/springframework/samples/petclinic/hibernate/HibernateClinicTests.java

 package org.springframework.samples.petclinic.hibernate;
 
 import org.springframework.samples.petclinic.AbstractClinicTests;
+import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ContextConfiguration;
 
 /**
@@ -15,6 +16,7 @@ import org.springframework.test.context.ContextConfiguration;
  * @author Sam Brannen
  */
 @ContextConfiguration
+@DirtiesContext
 public class HibernateClinicTests extends AbstractClinicTests {
 
 }

src/test/java/org/springframework/samples/petclinic/jdbc/SimpleJdbcClinicTests.java

 package org.springframework.samples.petclinic.jdbc;
 
 import org.springframework.samples.petclinic.AbstractClinicTests;
+import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ContextConfiguration;
 
 /**
@@ -14,6 +15,7 @@ import org.springframework.test.context.ContextConfiguration;
  * @author Thomas Risberg
  */
 @ContextConfiguration
+@DirtiesContext
 public class SimpleJdbcClinicTests extends AbstractClinicTests {
 
 }