hybrid: only call endburst once per connection

Since this is based off TS6, both initial PING and EOB are handled as endburst. However, ENDBURST should only be called once per session, or things are respawned automatically and nick collisions happen.

protocols/hybrid.py

@@ -19,11 +19,12 @@ class HybridProtocol(TS6Protocol):
         self.casemapping = 'ascii'
         self.caps = {}
         self.hook_map = {'EOB': 'ENDBURST', 'TBURST': 'TOPIC', 'SJOIN': 'JOIN'}
+        self.has_eob = False
 
     def connect(self):
         """Initializes a connection to a server."""
         ts = self.irc.start_ts
-
+        self.has_eob = False
         f = self.irc.send
 
         # https://github.com/grawity/irc-docs/blob/master/server/ts6.txt#L80
@@ -210,7 +211,10 @@ class HybridProtocol(TS6Protocol):
 
     def handle_eob(self, numeric, command, args):
         log.debug('(%s) end of burst received', self.irc.name)
-        return {}
+        if not self.has_eob:  # Only call ENDBURST hooks if we haven't already.
+            return {}
+
+        self.has_eob = True
 
     def handle_svsmode(self, numeric, command, args):
         """