Add icinga_stats collector

Commit adds icinga_stats collector which produces metrics by scraping data in
status.dat file produced by Icinga/Nagios.

Signed-off-by: Zdenek Styblik <zdenek.styblik@icflix.com>
Icinga Stats Collector - remove trailing wspace
Signed-off-by: Zdenek Styblik <zdenek.styblik@icflix.com>
Icinga Stats Collector - "translations" didn't work

Value translations didn't work, because "0,1,2" will match [0, 1]. Let's convert
given value to int which is exactly what we want.

Signed-off-by: Zdenek Styblik <zdenek.styblik@icflix.com>
icinga_stats - fix metric collision

Commit fixes metric collision between hosts.scheduled and
hosts.scheduled.{01,05,15}. This was caused by incorrect split().

Signed-off-by: Zdenek Styblik <zdenek.styblik@icflix.com>
Merge pull request #630 from zstyblik/pr-20140528-icinga

Add icinga_stats collector