On the log-addressing branch:  Return an error when the format file
specifies logical addressing in a non-shared repo.  Just disabling
logical addressing in that case could mask more severe issues.

* subversion/libsvn_fs_fs/fs_fs.c
  (read_format): create an error if layout & addressing are inconsistent

Suggested by: danielsh

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/log-addressing@1509609 13f79535-47bb-0310-9956-ffa450edef68