vstart: static mapping of names to ranks
vstart: static mapping of names to ranks

a always 0, b always 1, etc. makes multi-mds debugging much easier.

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@newdream.net>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph