data: remove redundant code
data: remove redundant code

Aws credentials are now managed by dvc/cloud/creds_aws.py

Signed-off-by: Ruslan Kuprieiev <f6538312ce47017d734b1357aabc970ebf896e32@gmail.com>

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