Clear gateway adapter globals cache after tests

Change-Id: I5075ae050732371c5f5dca9040e2d14d5d083054
GC: Check XML for CVV result, use blanks if missing

When confirming a credit card payment, check the XML even if we
were given a CVV/AVS result on the querystring.  Use blank strings
if no result exists in the XML.

Change-Id: I3b73e7e8c1e1f1b795178cbbb20870cd4ba6d861
Merge "Clear gateway adapter globals cache after tests"
Merge "GC: Check XML for CVV result, use blanks if missing"