Make DevTools DataSource auto-config back off without DataSourceProperties

Previously, if DataSourceAutoConfiguration had been explicitly excluded,
DevToolsDataSourceAutoConfiguration would cause refresh to fail due to
a missing DataSourceProperties bean. This commit corrects the condition
so that the auto-configuration is conditional on a DataSource bean and
a DataSourceProperties bean rather than only being conditional on one or
the other.

Closes gh-5269

spring-boot-devtools/src/test/java/org/springframework/boot/devtools/autoconfigure/DevToolsDataSourceAutoConfigurationTests.java

@@ -33,6 +33,8 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.jdbc.datasource.embedded.EmbeddedDatabase;
 
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.assertThat;
 import static org.mockito.BDDMockito.given;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
@@ -76,6 +78,15 @@ public class DevToolsDataSourceAutoConfigurationTests {
 		verify(statement).execute("SHUTDOWN");
 	}
 
+	@Test
+	public void configurationBacksOffWithoutDataSourceProperties() throws SQLException {
+		ConfigurableApplicationContext context = createContext("org.h2.Driver",
+				NoDataSourcePropertiesConfiguration.class);
+		assertThat(
+				context.getBeansOfType(DevToolsDataSourceAutoConfiguration.class).size(),
+				is(0));
+	}
+
 	private ConfigurableApplicationContext createContext(String driver,
 			Class<?>... classes) {
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
@@ -108,4 +119,14 @@ public class DevToolsDataSourceAutoConfigurationTests {
 
 	}
 
+	@Configuration
+	static class NoDataSourcePropertiesConfiguration {
+
+		@Bean
+		public DataSource in() {
+			return mock(DataSource.class);
+		}
+
+	}
+
 }