Make autorest.go version configurable. (#882)
Make autorest.go version configurable. (#882)

Added command flag 'a' to optionally specify autoret.go version.
Azure/azure-sdk-for-go,curoverse/azure-sdk-for-go,marstr/azure-sdk-for-go,Azure/azure-sdk-for-go,Azure/azure-sdk-for-go,Azure/azure-sdk-for-go,marstr/azure-sdk-for-go,marstr/azure-sdk-for-go,curoverse/azure-sdk-for-go