If env_or_profile is selected as the credentials_source, access_key and secret_access_key might still be used.
If env_or_profile is selected as the credentials_source, access_key and
secret_access_key might still be used.

[#103431370](https://www.pivotaltracker.com/story/show/103431370)

Signed-off-by: Alexey Miroshkin <be6cd0952be31b454c666ce224c5d25e39f82ff5@ru.ibm.com>

cloudfoundry-incubator/bosh-aws-cpi-release,cloudfoundry-incubator/bosh-aws-cpi-release,cloudfoundry-incubator/bosh-aws-cpi-release