Make EventBus Timeout Configurable

[kkoz]

Fixes #32

See glencoesoftware/omero-ms-image-region#160

This PR is mostly for consistency with omero-ms-image-region in allowing the configuration of the EventBus send timeout in the config.yml file.

Testing

Import a test image like 'test&sizeX=2304&sizeY=2304&sizeZ=12&sizeC=3&pixelType=uint16&sleepOpenBytes=1000.fake'. Note the image ID. Set the timeout to be less than 1000 ms and call

/tile/<image ID>/0/0/0?x=512&y=512&w=480&h=360&format=png

You should induce the timeout.
Increase the timeout in the config to be > 1000 ms and the request should succeed.

[sbesson]

Similarly to glencoesoftware/omero-ms-thumbnail#39 (review), used a synthetic file introducing a 5s delay when fetching a plane/tile.

When the micro-service is configured with a timeout of 5000 or lower, requests to the tile/ endpoint with this image fail with a io.vertx.core.eventbus.ReplyException: Timed out after waiting 5000(ms) for a reply as expection. Increasing the timeout via configuration file is sufficient to address the timeout issues