Provide Override switch to force renewal of credentials when temp creds in config

[blakeca00]

keyup Default functionality is to prohibit key rotation when sts temporary credentials are present in the awscli config and credentials are still ACTIVE.

User should be able to override this default functionality to rotate keys by giving --force option.

[blakeca00]

Issue #18 was marked as a duplicate of this issue.

[blakeca00]

--force

option