v5.1.2

Filter out RBL error responses to prevent false positives

Add checks to skip 127.255.255.x responses which indicate errors:
- 127.255.255.254 = Spamhaus rate limit exceeded / query refused
- 127.255.255.255 = General error / not authorized

Also skip any non-127.x.x.x responses as they are not valid RBL listings.

v5.1.1

Update monovm/collector-common version constraint