Bugfix for _get_port_info_by_portkey
Bugfix for _get_port_info_by_portkey

IndexError: list index out of range if vSphere returns free list
Multiple physical networks are now possible.

Mirantis/vmware-dvs,VTabolin/vmware-dvs,Mirantis/vmware-dvs,ekosareva/vmware-dvs,ekosareva/vmware-dvs