Fix 2 of the 3 broken integration tests.
Fix 2 of the 3 broken integration tests.

The two GitHub API tests were failing because the API requires a User-Agent header.

NFI what the "PostToRequestBin" test is supposed to do, so I left it broken.

ammachado/refit,paulcbetts/refit,ammachado/refit,PureWeen/refit,martijn00/refit,mteper/refit,jlucansky/refit,onovotny/refit,onovotny/refit,mteper/refit,paulcbetts/refit,PKRoma/refit,martijn00/refit,PureWeen/refit,jlucansky/refit