Handle "too many connections" error

[felixge]

Seems like yet another undocumented gem in the mysql protocol:

<- GREETING_PACKET: {"length":135,"received":135,"number":0,"type":0,"protocolVersion":255,"serverVersion":"i\u0004Host 'domU-12-31-39-10-71-32.compute-1.intern
al' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'"}

/usr/local/lib/node/.npm/mysql/0.7.0/package/lib/mysql/auth.js:30
  var stage3 = sha1(scramble.toString('binary') + stage2);
                             ^
TypeError: Cannot call method 'toString' of undefined
    at Object.token (/usr/local/lib/node/.npm/mysql/0.7.0/package/lib/mysql/auth.js:30:30)
    at Client._sendAuth (/usr/local/lib/node/.npm/mysql/0.7.0/package/lib/mysql/client.js:308:20)
    at Client._handlePacket (/usr/local/lib/node/.npm/mysql/0.7.0/package/lib/mysql/client.js:271:10)
    at Parser.<anonymous> (/usr/local/lib/node/.npm/mysql/0.7.0/package/lib/mysql/client.js:83:14)
    at Parser.emit (events:27:15)
    at /usr/local/lib/node/.npm/mysql/0.7.0/package/lib/mysql/parser.js:75:14
    at Parser.write (/usr/local/lib/node/.npm/mysql/0.7.0/package/lib/mysql/parser.js:565:7)
    at Stream.<anonymous> (/usr/local/lib/node/.npm/mysql/0.7.0/package/lib/mysql/client.js:64:16)
    at Stream.emit (events:27:15)
    at IOWatcher.callback (net:489:16)

[felixge]

This was fixed in 2461915