tests: remove unused Endpoint.pool_size member

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>

Author: jk-ozlabs

tests/mctpenv/__init__.py

@@ -303,7 +303,6 @@ def __init__(self, iface, lladdr, ep_uuid = None, eid = 0, types = None):
         self.eid = eid
         self.types = types or [0]
         self.bridged_eps = []
-        self.pool_size = 0
         self.allocated_pool = None # or (start, size)
 
         # keyed by (type, type-specific-instance)