Add compatibility to Opsview NRPE large output patch

This is just pseudo code that should loop/receive NRPE response packets until it receives a normal NRPE response packet.

I patched my NRPE agents to support larger output than 1 kB:
http://www.opsview.com/whats-new/blog/enhancing-nrpe-large-output

The normal check_nrpe plugin shows the large output correctly, but because Shinken uses the nrpe_poller module it stops after receiving the first 1024 byte :/

I could not bring the nrpe_poller to loop/receive more than 1kB, could you have a look and give me a hint, where I need to loop over the NRPE client responses?