Activate vCenter on the switch

        Args:
            name: (str) : Name of an established vCenter
            activate (bool) : Activates the vCenter if activate=True
                              else deactivates it
            callback (function): A function executed upon completion of the
                 method.

        Returns:
           Return value of `callback`.

        Raises:
            None

def activate_vcenter(self, **kwargs):
        """
        Activate vCenter on the switch

        Args:
            name: (str) : Name of an established vCenter
            activate (bool) : Activates the vCenter if activate=True
                              else deactivates it
            callback (function): A function executed upon completion of the
                 method.

        Returns:
           Return value of `callback`.

        Raises:
            None
        """
        name = kwargs.pop('name')
        activate = kwargs.pop('activate', True)
        vcenter_args = dict(id=name)
        method_class = self._brocade_vswitch
        if activate:
            method_name = 'vcenter_activate'
            vcenter_attr = getattr(method_class, method_name)
            config = vcenter_attr(**vcenter_args)
            output = self._callback(config)
            print output
            return output
        else:
            pass