Serious limitation of VMware::vCloud::vApp module.
It uses a class variable (i.e. our) to represent the vApp internal data.
Each time we instantiate a new vApp, the variable is overwritten with
the data of the newly instantiated vApp, so we loose the previously
instantiated vApp data.
The module does not inherit from VMware::vCloud::vApp any more.
Each vApp has its own private variable to represent vApp specific data.
Removed call to VMware::vCloud::vApp inherited method and debugging statement.