Remove requirement for Image extension to publish map services with mosaic datasets

[NateArnold]

Mosaic datasets can be consumed in any license level of ArcGIS for Desktop. However, if you attempt to publish a map service that uses a mosaic dataset, you'll find that the image extension is required.  I can see why it would be required for standalone image services (publishing the mosaic dataset directly), but it seems like publishing map services should not require the extension.  

[RyanKelso]

Yes please.  Mosaic datasets are great for managing large sets of tiled aerial imagery.  There's nothing really fancy going on here, we just want to publish our aerial imagery as a map service, nothing that should warrant the purchase of another expensive extension.