poker: add two more tests (#411)
poker: add two more tests (#411)

* Added a missing corner test-case where the lower of the two pairs wins
 if its higher than the others lower pair
* Added Highcard-fallback test for two-pair-equals-test
mweb/python,behrtam/xpython,N-Parsons/exercism-python,mweb/python,behrtam/xpython,smalley/python,pheanex/xpython,smalley/python,pheanex/xpython,jmluy/xpython,exercism/xpython,jmluy/xpython,exercism/python,N-Parsons/exercism-python,rootulp/xpython,exercism/xpython,rootulp/xpython,exercism/python