The first line of the response has a fixed format ("%-3d %-8u\n")
and consequently fixed length (CLI_LINE0_LEN == 13).

This makes parsing responses more efficient.  Add a function
in common_cli to do so.




git-svn-id: http://www.varnish-cache.org/svn/trunk@630 d4fa192b-c00b-0410-8231-f00ffab90ce4