Fix create_card_hold tests to use Braintree
Fix create_card_hold tests to use Braintree

studio666/gratipay.com,gratipay/gratipay.com,mccolgst/www.gittip.com,studio666/gratipay.com,eXcomm/gratipay.com,eXcomm/gratipay.com,mccolgst/www.gittip.com,gratipay/gratipay.com,studio666/gratipay.com,gratipay/gratipay.com,eXcomm/gratipay.com,studio666/gratipay.com,gratipay/gratipay.com,mccolgst/www.gittip.com,mccolgst/www.gittip.com,eXcomm/gratipay.com