Change Mock services to return their inputted values

src/main/edu/wisc/services/cbs/api/MockService.php

...wisc/services/cbs/order/header/MockOrderHeaderService.php

src/main/edu/wisc/services/cbs/order/header/OrderHeader.php

...ces/cbs/order/interfacing/MockOrderInterfacingService.php

...edu/wisc/services/cbs/order/line/MockOrderLineService.php

src/main/edu/wisc/services/cbs/order/line/OrderLine.php

src/main/edu/wisc/services/cbs/price/MockPriceService.php

...main/edu/wisc/services/cbs/product/MockProductService.php

src/main/edu/wisc/services/cbs/product/Product.php

.../services/cbs/order/header/MockOrderHeaderServiceTest.php

...cbs/order/interfacing/MockOrderInterfacingServiceTest.php

...wisc/services/cbs/order/line/MockOrderLineServiceTest.php

...ervices/cbs/order/payment/MockOrderPaymentServiceTest.php

...du/wisc/services/cbs/price/MockPriceServiceClientTest.php

...isc/services/cbs/product/MockProductServiceClientTest.php