In preparation for code re-organization, rename the Macvtap
management APIs to have the following patterns

  virNetDevMacVLanXXXXX     - macvlan/macvtap interface management
  virNetDevVPortProfileXXXX - virtual port profile management

* src/util/macvtap.c, src/util/macvtap.h: Rename APIs
* src/conf/domain_conf.c, src/network/bridge_driver.c,
  src/qemu/qemu_command.c, src/qemu/qemu_command.h,
  src/qemu/qemu_driver.c, src/qemu/qemu_hotplug.c,
  src/qemu/qemu_migration.c, src/qemu/qemu_process.c,
  src/qemu/qemu_process.h: Update for renamed APIs

This patch is rather cosmetic as it only moves device alias
assignation from command line construction just before that.
However, it is needed in connotation of previous and next patch.

Add test cases for parsing the qemu-name-space.
This is based on qemuxml2argv{test,data/}, but can not reside in
qemuxml2argv{test,data/} because ...

1. qemuxmlns-qemu-ns-domain.xml is not schema-valid and breaks
domainschematest. The test is still important to detect xmlns:qemu
bindings to a name-space other than
http://libvirt.org/schemas/domain/qemu/1.0

2. they break qemuxml2xml, because the xmlns:qemu binding is moved to
the top-level <domain> element when converting from argv to xml.
Signed-off-by: NPhilipp Hahn <hahn@univention.de>