Add the qa spec for bp:add-icehouse-swift-tests

Add the spec which describes why and how to add test cases of Swift functions
introduced in icehouse version.

Partially implements blueprint add-icehouse-swift-tests
Change-Id: I8ed2b8f05dd024246e534dd1ed6bd8b35e91a222
Merge "Add the qa spec for bp:add-icehouse-swift-tests"