AutoRest: support multiple API-versions.

[sergey-shandar]

Options

1

namespace A\_2017_01_01;
class B
{
    function __construct(RunTime $runTime)
    {
        ...
    }
    const SWAGGER_OBJECT_DATA = [ ... ];
} 

namespace A\_2017_02_02;
class B
{
    function __construct(RunTime $runTime, \A\_2017_01_01\B $_2017_01_01)
    {
        $this->_2017_01_01 = $_2017_01_01;
        ...
    }
    const SWAGGER_OBJECT_DATA = [ ... ];
}