Bump jetty-server in /mysql-replicator-commons (#49)

Bumps [jetty-server](https://github.com/eclipse/jetty.project) from 9.4.14.v20181114 to 9.4.17.v20190418.
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.14.v20181114...jetty-9.4.17.v20190418)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

mysql-replicator-commons/pom.xml

@@ -48,7 +48,7 @@
         <dependency>
             <groupId>org.eclipse.jetty</groupId>
             <artifactId>jetty-server</artifactId>
-            <version>9.4.14.v20181114</version>
+            <version>9.4.17.v20190418</version>
         </dependency>
         <dependency>
             <groupId>org.eclipse.jetty</groupId>