Fixing return type for Nova Floating IP Pool extension

Follow-up to 6b83679. Thanks to @jdaggett for spotting!
fix support for private images in SoftLayer
Updating jsch.agentproxy 0.0.7 -> 0.0.8

New version uses net.java.dev.jna:jna 4.1.0. The old version uses 3.4.0,
which is only LGPL-licensed.
Minor code cleanup in Apache HC config module

* Renaming provider
* Removing duplicate code
JCLOUDS-184: Improving AzureBlob unit tests