Use macro to swap data in spice_session_start_migrating()
Use macro to swap data in spice_session_start_migrating()

spice_session_start_migrating() swaps connection details between 2
SpiceSession instances. Instead of doing it manually, use a macro to do
it for us.

fgouget/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,SPICE/spice-gtk,elmarco/spice-gtk,Fantu/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,guodong/spice-gtk,Fantu/spice-gtk,elmarco/spice-gtk,SPICE/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,guodong/spice-gtk,SPICE/spice-gtk,flexVDI/spice-gtk,flexVDI/spice-gtk,guodong/spice-gtk,Fantu/spice-gtk,guodong/spice-gtk,elmarco/spice-gtk,elmarco/spice-gtk,Fantu/spice-gtk,fgouget/spice-gtk,SPICE/spice-gtk,fgouget/spice-gtk