Fix Tests Broken in 1.2

Remove one broken tax test. Fix another by backporting method expected
in EbayEnterprise_Eb2cCore_Test_Base. Remove tests mocking Spl objects.
DE2491 Unique Request Id in Allocation Requests

Use unique request ids for the allocation request message and the
rollback allocation request message. Use the eb2ccore/data helper's
`generateRequestId` to create the request ids.

Do not include the `<ReservationId>` node in the order create request
for items that do not have a reservation id.

Conflicts:
	src/app/code/community/EbayEnterprise/Eb2cInventory/Helper/Data.php
	src/app/code/community/EbayEnterprise/Eb2cInventory/Model/Allocation.php
	src/app/code/community/EbayEnterprise/Eb2cOrder/Test/Model/CreateTest.php
DE2506 Send Amount as AmountAuthorized in OCR

The payment method is no longer 'authorized' for PayPal
causing the payment 'amount_authorized' data not to be set
in `sales/order_payment` object. This causes the
'AmountAuthorized' node value in OCR to be sent as 0.0 value.
This causes OMS to cancel the payment of the order when the
`AmountAuthorized` node is 0.00. To remedy this issue we are
sending the order grand total as the amount authorized for the
PayPal payment.

Conflicts:

	src/app/code/community/EbayEnterprise/Eb2cOrder/Model/Create.php