Do not package MySQL Connector/J dependency

JDBC connectors should be deployed to the Servlet Container separatly.
The dependency is now only used for the embedded development Servlet
container and has been upgraded to version 8.0.x.

connector-service/build.gradle

@@ -30,10 +30,11 @@ dependencies {
 	implementation group: 'cglib', name: 'cglib', version: '3.1'
 	implementation group: 'ch.qos.logback', name: 'logback-classic'
 	implementation group: 'org.json', name: 'json', version: '20141113'
-	implementation group: 'mysql', name: 'mysql-connector-java', version: '5.1.34'
 
 	providedCompile group: 'javax.servlet', name: 'javax.servlet-api', version: '3.0.1'
 
+	providedRuntime group: 'mysql', name: 'mysql-connector-java', version: '8.0.16'
+
 	testImplementation group: 'junit', name: 'junit'
 	testImplementation group: 'org.mockito', name: 'mockito-core'
 	testImplementation group: 'org.dbunit', name: 'dbunit', version: '2.5.0'