Reset the currentSchema and currentCatalog back to null on reset

Author: rbygrave

ebean-datasource/src/main/java/io/ebean/datasource/pool/PooledConnection.java

@@ -422,11 +422,13 @@ public void close() throws SQLException {
 
       if (resetSchema) {
         connection.setSchema(originalSchema);
+        currentSchema = null;
         resetSchema = false;
       }
 
       if (resetCatalog) {
         connection.setCatalog(originalCatalog);
+        currentCatalog = null;
         resetCatalog = false;
       }