Add tags to CloudSQL samples (GoogleCloudPlatform#1100)

* Added tags for plugins.

* Add tags to config.properties.

Author: kurtisvg

appengine-java8/cloudsql-postgres/pom.xml

@@ -88,6 +88,7 @@
     <!-- for hot reload of the web application -->
     <outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
     <plugins>
+      <!-- [START plugins] -->
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-war-plugin</artifactId>
@@ -113,7 +114,7 @@
           <deploy.stopPreviousVersion>true</deploy.stopPreviousVersion>
         </configuration>
       </plugin>
-
+      <!-- [END plugins] -->
     </plugins>
   </build>
 </project>

appengine-java8/cloudsql/pom.xml

@@ -88,6 +88,7 @@
     <!-- for hot reload of the web application -->
     <outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
     <plugins>
+      <!-- [START plugins] -->
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-war-plugin</artifactId>
@@ -113,7 +114,7 @@
           <deploy.stopPreviousVersion>true</deploy.stopPreviousVersion>
         </configuration>
       </plugin>
-
+      <!-- [END plugins] -->
     </plugins>
   </build>
 </project>

flexible/cloudsql/src/main/resources/config.properties

@@ -11,5 +11,6 @@
 # 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.
-
+# [START properties]
 sqlUrl=${sqlURL}
+# [END properties]