ISPN-3809 Manual indexing cannot be triggered when running in server mode

The MapReduceInitializer is not loaded from server classpath due to misconfiguration of module.xml and as a consequence the m/r task is not properly initialized.

* Add ManualIndexingTest for server
* Fix module dependencies so MapReduceInitializer gets loaded properly
* Also modify RemoteQueryTest.readClasspathResource to use Util.readStream instead of duplicating the code