Add multi-release jars to enable Java Modules

[yschimke]

Attempting to apply multi-release Jars and use it to add java9/module-info.java files.

This should run a HTTP request against square.com using a jlink image.

./gradle okhttp-module-tests:imageRun

Todo

• Enable OkHttp modules in the test to flush out errors
• Setup a CI job probably testing against Mockserver

[yschimke]

Current status! resolved

Exception in thread "main" java.lang.IllegalAccessError: class okhttp3.internal.concurrent.TaskRunner (in module okhttp3) cannot access class java.util.logging.Logger (in module java.logging) because module okhttp3 does not read module java.logging
	at okhttp3/okhttp3.internal.concurrent.TaskRunner.<clinit>(TaskRunner.kt:362)