On the log-addressing branch:  Follow-up to r1516325.  Update the
r0 template.

* subversion/libsvn_fs_fs/fs_fs.c
  (write_revision_zero): update phys-to-log index template for rev 0

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/log-addressing@1516327 13f79535-47bb-0310-9956-ffa450edef68