Fix softlayer: delete custom code; rely on jclouds

The SoftLayerFastVirtualGuestToNodeMetadata broke softlayer for me: when I provisioned a VM, the NodeMetadata returned had a null imageId and null OperatingSystem, which caused an NPE in JcloudsLocation.createUser.

Deleting that class to rely on normal jclouds 1.8 fixed the problem for me.
i'd kinda like to keep this even if empty because it was *painful* to figure out how to do it and i'd hate to go through that again.  but then again i'm not likely to forget it so fine to delete it!