VMware: use oslo_config new type PortOpt
VMware: use oslo_config new type PortOpt

Now oslo_config provides new type PortOpt for
validating Port, min and max port are no need here.

Change-Id: I2ad2811285aec4897c79b151ac2245d483b36876

hanlind/nova,BeyondTheClouds/nova,rajalokan/nova,hanlind/nova,vmturbo/nova,zhimin711/nova,vmturbo/nova,alaski/nova,mahak/nova,cyx1231st/nova,gooddata/openstack-nova,bigswitch/nova,rajalokan/nova,cyx1231st/nova,cloudbase/nova,zhimin711/nova,apporc/nova,cloudbase/nova,vmturbo/nova,jianghuaw/nova,cernops/nova,gooddata/openstack-nova,hanlind/nova,rahulunair/nova,phenoxim/nova,vmturbo/nova,klmitch/nova,sebrandon1/nova,openstack/nova,mikalstill/nova,klmitch/nova,rahulunair/nova,sebrandon1/nova,alaski/nova,BeyondTheClouds/nova,dims/nova,jianghuaw/nova,gooddata/openstack-nova,dims/nova,mahak/nova,mikalstill/nova,devendermishrajio/nova,BeyondTheClouds/nova,rajalokan/nova,apporc/nova,bigswitch/nova,jianghuaw/nova,cernops/nova,jianghuaw/nova,devendermishrajio/nova,cernops/nova,mahak/nova,klmitch/nova,Juniper/nova,rahulunair/nova,Juniper/nova,phenoxim/nova,Juniper/nova,CEG-FYP-OpenStack/scheduler,NeCTAR-RC/nova,openstack/nova,gooddata/openstack-nova,NeCTAR-RC/nova,mikalstill/nova,CEG-FYP-OpenStack/scheduler,klmitch/nova,cloudbase/nova,rajalokan/nova,openstack/nova,sebrandon1/nova,Juniper/nova