*Really* allow community asyn_lpa test to have two answers (#2341)

Fail more clearly in test_asyn_lpa, using nosetests asserts.
Note that: set(frozenset(iterable)) == set(iterable)

networkx/algorithms/community/tests/test_asyn_lpa.py

@@ -1,4 +1,4 @@
-from nose.tools import assert_equal
+from nose.tools import assert_equal, assert_in
 from networkx import asyn_lpa, Graph
 
 
@@ -107,4 +107,4 @@ def test_two_communities():
     communities = asyn_lpa.asyn_lpa_communities(test)
     result = {frozenset(c) for c in communities}
     # probabilitistic result could be all nodes in one community. So test result is either.
-    assert(result in [ground_truth, set(frozenset(range(16)))])
+    assert_in(result, [ground_truth, {frozenset(range(16))}])