Bump terraform-svchost to v0.2.0

[brandonc]

When connected to HCPTF/TFE, terraform-svchost performs some service discovery request, at least two during terraform init. Troublingly, terraform-svchost only attempts one request for each discovery, so any network or service failure can cause CLI errors before plan or apply begins. We've noticed that the vast majoring of these requests succeed in < 100ms, but at scale, many requests per day can hang for various reasons, including temporary internet connection problems or just basic service availability during transition states.

terraform-svchost v0.2.0 adds hedged http requests, attempting the discovery request on a short 1.5s interval for up to 7 times and using the first response having < 500 status.

In practical terms, service discovery will time out after 11 seconds if there is no network response, as it did previously... but the difference is that during this 11 seconds, 7 requests are attempted instead of 1.

Target Release

1.15.0

Rollback Plan

• If a change needs to be reverted, we will roll out an update to the code within 7 days.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

CHANGELOG entry

• This change is user-facing and I added a changelog entry.
• This change is not user-facing.

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