Tweak 'svnadmin info' output.

* subversion/svnadmin/svnadmin.c
  (subcommand_info):
    Print the FS format number where all other FS info is printed.

New output:
    Path: r
    Repository Format: 5
    Compatible With Version: 1.8.0
    Repository Capabilities: mergeinfo
    Filesystem Type: fsfs
    Filesystem Format: 6
    FSFS Sharded: yes
    FSFS Shard Size: 1000
    FSFS Packed: yes
    Configuration File: r/db/fsfs.conf


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1483847 13f79535-47bb-0310-9956-ffa450edef68