Ignore some new flake8 warnings (#6602)

Author: msullivan

setup.cfg

@@ -41,7 +41,9 @@ exclude =
 #   B3??: Python 3 compatibility warnings
 #   B006: use of mutable defaults in function signatures
 #   B007: Loop control variable not used within the loop body.
-ignore = E251,E128,F401,W601,E701,W503,W504,E704,E402,B3,B006,B007
+#   B011: Don't use assert False
+#   B009: Don't use getattr with constant strings (FIXME)
+ignore = E251,E128,F401,W601,E701,W503,W504,E704,E402,B3,B006,B007,B011,B009
 
 [coverage:run]
 branch = true