Add option to force path style s3 uploads.

[ainmosni]

This patch adds an option to force path style s3 uploads. This is useful
when a third-party s3 endpoint doesn't support the subdomain style
uploads that's default in s3.

This is a fix for #2035.

[etcd-bot]

Can one of the admins verify this patch?

[etcd-bot]

Can one of the admins verify this patch?

[etcd-bot]

Can one of the admins verify this patch?

[ainmosni]

Because of the year change, the generated code verifier complained which prompted me to regenerate all the generated code. This makes the PR a bit more noisy than I'd like. If wanted, I can split up the PRs.

[hexfusion]

@ainmosni yeah we don't need to update the year just go ahead and remove that and we can go from there. Thanks!

[ainmosni]

@hexfusion Done, cleaned out the generated code.

[hexfusion]

@etcd-bot ok to test

[hexfusion]

@ainmosni I am terribly sorry I skimmed through this quick and didn't realize these dates were machine generated output. So alas you will need to return these dates so that CI will pass. Again sorry about this, and thanks again for the PR and your time.

[ainmosni]

@hexfusion No problem, I regenerated the code to have the local unit tests pass in the first place. 😁 I've readded them.

[hexfusion]

@ainmosni this looks good can you rebase these commits as pkg/*:Add option to force path style s3 uploads. and update the CHANGELOG please. Ping me when done and I will get this merged.

[ainmosni]

@hexfusion Done and done.

[hexfusion]

LGTM

[hexfusion]

@ainmosni thank you!

[ainmosni]

@hexfusion No, thank you, saves me from keeping a custom fork around to use our s3 setup. :)