[#1770] Feature: IP address allow/deny support

[mattrpav]

This feature adds IP allow/deny support at the transport layer, before any protocol negotiation. On deny, connections are quietly closed and a counter is incremented.

• Addresses may be entered in CIDR format or exact IP value.
• Allow/Deny list supports string file: uri support to load from a properties file (one CIDR per-line) with default DoS/memory bloat protections in place (10MB and 100,000 entries).

Notes:

1. Failover will retry indefinitely
2. SSl and non-SSL see an EOF or connection closed by peer error.

[jbonofre]

As you can see in the issue, I had something about that. I would appreciate you ping me before doing work (not the first time it happens).