Added a sample that illustrates using multiple DataSources

This PR adds a sample that illustrates the use of multiple DataSources
in a single Spring Cloud Task application.

Resolves #413

Updated based on code review

spring-cloud-task-samples/multiple-datasources/src/test/java/io/spring/MultiDataSourcesApplicationTests.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.spring;
+
+import org.junit.Rule;
+import org.junit.Test;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.test.rule.OutputCapture;
+
+import static org.junit.Assert.assertTrue;
+
+/**
+ * @author Michael Minella
+ */
+public class MultiDataSourcesApplicationTests {
+
+	@Rule
+	public OutputCapture outputCapture = new OutputCapture();
+
+	@Test
+	public void testTimeStampApp() throws Exception {
+
+		SpringApplication.run(MultipleDataSourcesApplication.class, new String[0]);
+
+		String output = this.outputCapture.toString();
+
+		assertTrue("Unable to find CommandLineRunner output: " + output,
+				output.contains("There are 2 DataSources within this application"));
+		assertTrue("Unable to find start task message: " + output,
+				output.contains("Creating: TaskExecution{"));
+		assertTrue("Unable to find update task message: " + output,
+				output.contains("Updating: TaskExecution"));
+	}
+}

spring-cloud-task-samples/multiple-datasources/src/test/resources/application.properties

@@ -0,0 +1,18 @@
+#
+# Copyright 2016 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+spring.application.name=Demo Multiple DataSources Task
+logging.level.org.springframework.cloud.task=DEBUG