Specify endpoint_url on S3 session client
Specify endpoint_url on S3 session client

We have to specify `endpoint_url` option for S3 Session client
along with Resource object.

dataversioncontrol/dvc,efiop/dvc,dmpetrov/dataversioncontrol,dataversioncontrol/dvc,dmpetrov/dataversioncontrol,efiop/dvc