Added %I and %O formatters to varnishncsa
Added %I and %O formatters to varnishncsa

This adds %I and %O formatters to varnishncsa, which are total bytes
received and total bytes sent. These are similar to the same
formatters in apache (with mod_logio). Useful for bandwidth accounting.

Patch by: David Robertson

gquintard/Varnish-Cache,alarky/varnish-cache-doc-ja,feld/Varnish-Cache,franciscovg/Varnish-Cache,alarky/varnish-cache-doc-ja,ajasty-cavium/Varnish-Cache,zhoualbeart/Varnish-Cache,franciscovg/Varnish-Cache,feld/Varnish-Cache,zhoualbeart/Varnish-Cache,ajasty-cavium/Varnish-Cache,feld/Varnish-Cache,varnish/Varnish-Cache,ajasty-cavium/Varnish-Cache,varnish/Varnish-Cache,chrismoulton/Varnish-Cache,gquintard/Varnish-Cache,chrismoulton/Varnish-Cache,mrhmouse/Varnish-Cache,ajasty-cavium/Varnish-Cache,zhoualbeart/Varnish-Cache,gquintard/Varnish-Cache,franciscovg/Varnish-Cache,varnish/Varnish-Cache,alarky/varnish-cache-doc-ja,ajasty-cavium/Varnish-Cache,chrismoulton/Varnish-Cache,gauthier-delacroix/Varnish-Cache,gauthier-delacroix/Varnish-Cache,franciscovg/Varnish-Cache,franciscovg/Varnish-Cache,alarky/varnish-cache-doc-ja,gquintard/Varnish-Cache,mrhmouse/Varnish-Cache,gauthier-delacroix/Varnish-Cache,varnish/Varnish-Cache,zhoualbeart/Varnish-Cache,feld/Varnish-Cache,chrismoulton/Varnish-Cache,gauthier-delacroix/Varnish-Cache,mrhmouse/Varnish-Cache,mrhmouse/Varnish-Cache,varnish/Varnish-Cache,gauthier-delacroix/Varnish-Cache,feld/Varnish-Cache,zhoualbeart/Varnish-Cache,chrismoulton/Varnish-Cache,alarky/varnish-cache-doc-ja,mrhmouse/Varnish-Cache