Refactored code and change return error code to exceptions.

Adjusted class now it inherited from base.

In vmwarecli added
 - Provides capability to create and delete VDC for specific organization.
 - Create, delete and manage network for specific VDC
 - List deployed VM's , VAPPs, VDSs, Organization
 - View detail information about VM / Vapp , Organization etc
 - Operate with images upload / boot / power on etc

Signed-off-by: bayramov <mbayramov@vmware.com>