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.