VMwareESXiMonitor 2.0.0

I have made a lot of changes to the ZenPack to make it work with Zenoss 4.2 and increase overall performance + functionality.

Key changes include:
- Significant Performance improvements (modeling as well as monitoring)
- Added Datastore modeling and monitoring
- Added Interface modeling
- Removed dependencies
- Removed limitation (not required to use the FQDN of the ESXi anymore,
name will be detected during modeling)

The ZenPack has been tested with Zenoss 4.2.4 and 4.2.5.