[py3] Increase default MAX_NUMBER_OF_SESSIONS to 10

apps/beeswax/src/beeswax/conf.py

@@ -240,7 +240,7 @@ MAX_NUMBER_OF_SESSIONS = Config(
           # does not have ability to manage them effectively. The cost of a session is low
           "-1 is unlimited number of sessions."),
   type=int,
-  default=1
+  default=-1
 )
 
 THRIFT_VERSION = Config(