* Skip IAM/STS validation and metadata check
* Skip IAM/STS identity validation - For environments or other api
implementations where there are no IAM/STS endpoints available, this
option lets you opt out from that provider initialization step.
* Skip metdata api check - For environments in which you know ahead of
time there isn't going to be a metadta api endpoint, this option lets
you opt out from that check to save time.
* Allow iam/sts initialization even if skipping account/cred validation
(#7874)
* Split out skip of IAM validation into credentials and account id
(#7874)
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