Blacklist host when send fails, fixes error when only one TSD defined

Signed-off-by: Benoit Sigoure <tsunanet@gmail.com>
procstats.py: Collect interrupt statistics from /proc/interrupts

Collect per CPU interrupts statistics from /proc/interrupts.
Metric name: proc.interrupts
Interrupt types are classified per "type" tag.

Signed-off-by: Benoit Sigoure <tsunanet@gmail.com>