NRPE network error messages

[Jason Martin]

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It would be nice if the my_connect function in utils.c in NRPE returned 
error messages prefixed with "CHECK_NRPE:", as a 'connection refused by 
host' can be confusing if it is not obvious where the refusal came from.

An example would be if using a check_tcp command via nrpe; the refual may 
have come from the nrpe host or the host being targeted by check_tcp. 
Whenever check_nrpe fails to execute the remote plugin it should make it's 
existance known, breaking from its usual 'transparent' nature.

Thanks
- -Jason Martin
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