Rename the virVirtualPortProfileParams struct to be
virNetDevVPortProfile, and rename the APIs to match
this prefix.

* src/util/network.c, src/util/network.h: Rename port profile
  APIs
* src/conf/domain_conf.c, src/conf/domain_conf.h,
  src/conf/network_conf.c, src/conf/network_conf.h,
  src/network/bridge_driver.c, src/qemu/qemu_hotplug.c,
  src/util/macvtap.c, src/util/macvtap.h: Update for
  renamed APIs/structs