ostadmin: [incompat syntax change] Allow deploying any revision

ostadmin: [incompat syntax change] Allow deploying any revision

The old command line syntax assumed you wanted the latest from
a given revision, but to bisect, you really want the ability
to deploy any given one.

Old:
$ ostadmin deploy gnomeos-3.6-i686-{runtime,devel}

New:

$ ostadmin deploy trees/gnomeos-3.6-i686-runtime
$ ostadmin deploy trees/gnomeos-3.6-i686-devel

And note that the deploy directory now changes to:
/ostree/trees/gnomeos-3.6-i686-devel

And now it's possible to:

$ ostadmin deploy trees/gnomeos-3.6-i686-devel trees/gnomeos-3.6-i686-devel^^^