bind user agent script is extremely slow

unix-agent ships with a local bash script called "bind" which parses the rndc stats output for pretty reporting.

After adding some new zones (to blackhole malware), the bash script is taking an age to parse the stats file which means running the agent can take upwards of a minute to complete it's run.
Admittedly I have added >14,000 zones in an attempt to protect users from known malware domains, however bind itself seems to deal with this just fine.

#time /usr/bin/observium_agent
real 0m38.804s
user 0m2.508s
sys 0m2.546s

#time /usr/lib/observium_agent/local/bind
real 0m41.357s
user 0m2.968s
sys 0m2.687s

1. time rndc stats
   real 0m0.021s
   user 0m0.001s
   sys 0m0.001

I have noticed that Chris started writing a perl based agent (http://jira.observium.org/browse/OBSERVIUM-250) which seems far faster to deal with the parsing, though I've yet to apply the patch to observium.
I'd like to push for this making it into the main release due to the speedup reasons.

1. time perl bind-observium-250
   real 0m0.044s
   user 0m0.019s
   sys 0m0.008s