hammer info command

[Antonio Huete Jimenez]

Hi all,

This patch adds 'hammer info' command to the hammer(8) utility. It
shows some extra information about mounted hammer filesystems.

http://gitweb.dragonflybsd.org/~tuxillo/dragonfly.git/commitdiff/c980b7917844be5921dd90737ea7dc522c15c178

In my DFBSD VM with three really small HAMMER FS,  the output looks
like this one:

http://pastebin.ca/1484319

Cheers,
Antonio Huete