[FLINK-3511] [jdbc] Move jdbc examples to test scope and add flink-clients dependency

flink-batch-connectors/flink-jdbc/pom.xml

@@ -43,6 +43,13 @@ under the License.
 			<scope>provided</scope>
 		</dependency>
 
+		<dependency>
+			<groupId>org.apache.flink</groupId>
+			<artifactId>flink-clients_2.10</artifactId>
+			<version>${project.version}</version>
+			<scope>test</scope>
+		</dependency>
+
 		<dependency>
 			<groupId>org.apache.derby</groupId>
 			<artifactId>derby</artifactId>