Py3: Replace filter()/map() if a list is needed
Py3: Replace filter()/map() if a list is needed

-- "cls.scenarios = filter(f, cls.scenarios)"
It's better to set a list to cls.scenarios but filter()/map() returns
an iterator on Python 3. This patch we replaced the filter()/map() with
a list comprehension in test_server.py.

Change-Id: I16640e564d41c6a1c29e229049467ae788bb1437

ozamiatin/oslo.messaging,dukhlov/oslo.messaging,dukhlov/oslo.messaging,ozamiatin/oslo.messaging