Add information about addressing mode of FSFS repositories to 'svnadmin 
info'.

* subversion/include/svn_fs.h
  (svn_fs_fsfs_info_t): Add new LOG_ADDRESSING field.

* subversion/libsvn_fs_fs/fs.c
  (fs_info): Initialize INFO->LOG_ADDRESSING.

* subversion/svnadmin/svnadmin.c
  (subcommand_info): Print information about addressing mode for FSFS 
   repository.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1640197 13f79535-47bb-0310-9956-ffa450edef68