Reorder AppRole.map_val parameters
Reorder AppRole.map_val parameters

map_val is only used by AppRole.__init__,
and the latter passes dest dict as the first argument [0],
while map_val has src as the first parameter [1].

It makes sense to fix map_val signature and put dest on the first place.
This way we change only one line
and at the same time make it to follow traditions of some other languages [2].

[0] https://github.com/Autodesk/aomi/blob/028d75307a54f69b27a53a0a349910af7e3aac47/aomi/model/auth.py#L184-L194
[1] https://github.com/Autodesk/aomi/blob/028d75307a54f69b27a53a0a349910af7e3aac47/aomi/model/auth.py#L163-L173
[2] http://lemire.me/blog/2016/09/06/function-signature-how-do-you-order-parameters/
otakup0pe/aomi,otakup0pe/aomi