Decide how to handle control port events for IPv6 reachability self-tests
The control spec has two reachability self-test events.
Here is how they are specified:
CHECKING_REACHABILITY "ORADDRESS=IP:port" "DIRADDRESS=IP:port" We're going to start testing the reachability of our external OR port or directory port. REACHABILITY_SUCCEEDED "ORADDRESS=IP:port" "DIRADDRESS=IP:port" We successfully verified the reachability of our external OR port or directory port (depending on which of ORADDRESS or DIRADDRESS is given.)
And here is what tor actually sends:
CHECKING_REACHABILITY ORADDRESS=IPv4:port CHECKING_REACHABILITY DIRADDRESS=IPv4:port REACHABILITY_SUCCEEDED ORADDRESS=IPv4:port REACHABILITY_SUCCEEDED DIRADDRESS=IPv4:port
When we add IPv6 reachability events, we could break some (buggy) control parsers with:
CHECKING_REACHABILITY ORADDRESS=[IPv6]:port REACHABILITY_SUCCEEDED ORADDRESS=[IPv6]:port
How should we handle this change?
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