mock: in order mock calls

[ReyOrtiz]

Summary

Add helper method to declare the order of the mock calls.

Changes

• add InOrder(calls ...*Call) helper method to declare the order of mock calls by calling NotBefore()

Motivation

This is probably the only feature I miss from gomock.InOrder(), it is more intuitive and cleaner to declare the order of the mock calls. Probably most cases can be satisfied with this method.

InOrder(
	mockedService1.On("TheExampleMethod", 1, 2, 3).Return(4, nil),
	mockedService2.On("TheExampleMethod2", true).Return(),
	mockedService3.On("TheExampleMethod3", "abc", 3).Return(false, nil),
)

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