[ANNOUNCE] Switching to qemu-xen.git and qemu-xen-traditional.git

[Ian Campbell <ian.campbell@citrix.com>]

I have just completed the switch to use a single qemu tree for each of the
versions we support (qemu-xen AKA upstream and qemu-xen-traditional AKA our
historical fork).

Instead of the individual Xen release specific repositories the QEMU trees
are now:

http://xenbits.xen.org/gitweb/?p=qemu-xen-traditional.git
http://xenbits.xen.org/gitweb/?p=qemu-xen.git

(see those pages for the new URLs). Each Xen release now corresponds to
branches within those repositories.

For qemu-xen.git there are staging+master and staging-X.Y+stable-X.Y
branches, representing tested and untested (by osstest push gate).

For qemu-xen-traditional.git there are only master and stable-X.Y branches.

The changes to use these trees instead of the old ones are now in
xen.git#staging and will be backported to stable branches and releases in
due course.

The old qemu-upstream stable qemu-upstream-X.Y-testing.git repositories are
being kept for the time being and are updated by osstest in lockstep with
the branches in the new tree via the relevant flights.

The old qemu-traditional stable repositories qemu-xen-X.Y-testing.git are
being kept for the time being and Ian J will push to them along with the
new branches (these trees do not have a push gate).

All of these will be removed eventually, i.e. at the soonest when a
relevant stable release has occurred.

The old development repos (qemu-xen=qemu-upstream-unstable and qemu-xen
-traditional=qemu-xen-unstable.git) remain for now but will not see any
further updates. These will be removed soon, once osstest no longer
references them for bisects.

All of the staging/qemu-* trees have already been removed.

Ian