Fix tests
Fix tests

Functional test change the content of POTENTIAL_HTTP_PORTS
but don't reset it. Ignore those changes.

demianbrecht/HTTPretty,BenjamenMeyer/HTTPretty,pxg/HTTPretty,xgess/HTTPretty,Multiposting/HTTPretty,letolab/HTTPretty,BenjamenMeyer/HTTPretty,andresriancho/HTTPretty,andresriancho/HTTPretty,xgess/HTTPretty,Multiposting/HTTPretty,letolab/HTTPretty,paylogic/HTTPretty,BenjamenMeyer/HTTPretty,demianbrecht/HTTPretty,codepython/HTTPretty,codepython/HTTPretty,pxg/HTTPretty,xgess/HTTPretty,paylogic/HTTPretty,gabrielfalcao/HTTPretty,demianbrecht/HTTPretty,andresriancho/HTTPretty,Multiposting/HTTPretty,andresriancho/HTTPretty,pxg/HTTPretty,gabrielfalcao/HTTPretty,codepython/HTTPretty,paylogic/HTTPretty,letolab/HTTPretty