Xen-4.5.0-rc3: Update tag for qemu-xen.

QEMU-traditional has nothing new, so stay at rc1 there.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Merge branch 'master' of xenbits.xen.org:/home/xen/git/xen into staging