Update vault_token_create orphan support to use new hvac method

[briantist]

SUMMARY

The method in hvac that can be used to create orphan tokens through the /create-orphan endpoint is deprecated for removal in v1, but had no replacement.

With hvac/hvac#869 a replacement is being introduced for the 1.0.0 release.

We'll need to update vault_token_create to use this new method.

We will prefer this one, but also fall back to the old one, so that we keep compatibility with older versions of hvac for a bit.

The best-effort fallback to the method that requires root can be removed without deprecation; it was put in place as a potential fallback in case hvac 1.0.0 was released with no replacement, so with a replacement now there's no need to use it.

ISSUE TYPE

• Feature Idea

COMPONENT NAME

vault_token_create

[briantist]

Now that hvac 1.0.0 is out the integration tests are broken until this issue is resolved.