Add dogwrap site option to send to US3 site

[holidayworking]

What does this PR do?

It solves https://github.com/DataDog/datadogpy/issues/748.

Description of the Change

Add dogwrap site option to send to US3 site.

Alternate Designs

N/A

Possible Drawbacks

N/A

Verification Process

Tested manually.

Additional Notes

N/A

Release Notes

N/A

Review checklist (to be filled by reviewers)

• [ ] Feature or bug fix MUST have appropriate tests (unit, integration, etc...)
• [ ] PR title must be written as a CHANGELOG entry (see why)
• [ ] Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• [ ] PR must have one changelog/ label attached. If applicable it should have the backward-incompatible label attached.
• [ ] PR should not have do-not-merge/ label attached.
• [ ] If Applicable, issue must have kind/ and severity/ labels attached at least.

[nkzou]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 2 pipeline(s).

[holidayworking]

@nkzou Thank you.