* StorPool storage plugin
Adds volume storage plugin for StorPool SDS
* Added support for alternative endpoint
Added option to switch to alternative endpoint for SP primary storage
* renamed all classes from Storpool to StorPool
* Address review
* removed unnecessary else
* Removed check about the storage provider
We don't need this check, we'll get if the snapshot is on StorPool be
its name from path
* Check that current plugin supports all functionality before upgrade CS
* Smoke tests for StorPool plug-in
* Fixed conflicts
* Fixed conflicts and added missed Apache license header
* Removed whitespaces in smoke tests
* Added StorPool plugin jar for Debian
the StorPool jar will be included into cloudstack-agent package for
Debian/Ubuntu
