Does Doubling Season creates attacking tokens with Hanweir Garrison?
Yes, all token creatures created by Hanweir Garrison etc. will be tapped and attacking, no matter how many are created.

Doubling Season (and Anointed Procession), as you noted, are replacement effects. The original effect never happens. In particular, Doubling Season replaces Hanweir Garrison's ability with the same ability, except it doubles the number of creature tokens the effect creates. 


  614.6. If an event is replaced, it never happens. A modified event occurs instead, which may in turn trigger abilities. [..]


When Hanweir garrison's ability resolves with Doubling Season in play, its effect will simply read


  Put four 1/1 red Human creature tokens onto the battlefield tapped and attacking.