vfs: Pass S3 provider-specific options to clients

[hakman]

This is mostly a refactoring proposal. WDYT?

/cc @rifelpet @moshevayner

[hakman]

/test pull-kops-aws-upgrade-k135-ko135-to-kstable-kolatest-many-addons

[hakman]

/test pull-kops-aws-upgrade-k135-ko135-to-kstable-kolatest-many-addons

[moshevayner]

I really like that approach! Would definitely add needed flexibility for future providers that use S3 with different option sets

[k8s-ci-robot]

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[k8s-ci-robot]

@hakman: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-aws-upgrade-k135-ko135-to-kstable-kolatest-many-addons	a60550e	link	false	/test pull-kops-aws-upgrade-k135-ko135-to-kstable-kolatest-many-addons

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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