fixed bug where duplicated parameters were being added at the operation level.
fixed bug where duplicated parameters were being added at the operation level.

fearthecowboy/autorest,Azure/autorest,fearthecowboy/autorest,Azure/autorest,jhendrixMSFT/autorest,jhendrixMSFT/autorest,Azure/autorest,Azure/autorest,jhendrixMSFT/autorest,jhendrixMSFT/autorest