Only set most recent state

Before, it would delve back to set state if recent entries indicated to not
assert the tracked states.  Correct that behavior so only last entry counts.

confluent/log.py

@@ -155,7 +155,7 @@ class Logger(object):
         binidx = binfile.tell() - 16
         currsize = 0
         offsets = collections.deque()
-        termstate = 0
+        termstate = None
         while binidx > 0 and currsize < size:
             binfile.seek(binidx, 0)
             binidx -= 16
@@ -168,7 +168,8 @@ class Logger(object):
                 continue
             currsize += datalen
             offsets.append((offset, datalen))
-            termstate = termstate | eventaux
+            if termstate is None:
+                termstate = termstate | eventaux
         fcntl.flock(binfile, fcntl.LOCK_UN)
         binfile.close()
         textdata = ''