Merge pull request #736 from magento-qmt/PR

[Mavericks] Extend functional tests coverage

Tasks:
- MTA-3896: Add variation for Place order via Payflow Pro with success AVS ZIP verification
- MTA-3898: Add variation for Place order via Payflow Pro with success CVV verification
- MTA-3895: Add variation to CreateOnlineCreditmemoTest with PayPal Payflow Pro
- MTA-3900: Create auto test to Refund an order placed through Braintree with full capture
- MTA-3952: Refactoring comments history block in Order module
- MTA-3901: Add variation for Partial Refund an order placed through Braintree with Partial capture