Don't call close() on JNDI DataSource

Update the JNDI auto-configured DataSource so that the close method
isn't called when the ApplicationContext is closed.

Fixes gh-1520

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/JndiDataSourceAutoConfiguration.java

@@ -44,11 +44,11 @@ import org.springframework.jdbc.datasource.lookup.JndiDataSourceLookup;
 @EnableConfigurationProperties(DataSourceProperties.class)
 public class JndiDataSourceAutoConfiguration {
 
-	@Bean
+	@Bean(destroyMethod = "")
 	@ConditionalOnMissingBean
 	public DataSource dataSource(DataSourceProperties properties) {
 		JndiDataSourceLookup dataSourceLookup = new JndiDataSourceLookup();
 		return dataSourceLookup.getDataSource(properties.getJndiName());
 	}
 
-}
\ No newline at end of file
+}