* Option to set HCP client at runtime
Allows us to initially set a nil HCP client for the
telemetry provider and update it later.
* Set telemetry provider HCP client in HCP manager
Set the telemetry provider as a dependency and pass it to
the manager. Update the telemetry provider's HCP client
when the HCP manager starts.
* Add a provider interface for the metrics client
This provider will allow us to configure and reconfigure the
retryable HTTP client and the headers for the metrics client.
* Move HTTP retryable client to separate file
Copied directly from the metrics client.
* Abstract HCP specific values in HTTP client
Remove HCP specific references and instead initiate with
a generic TLS configuration and authentication source.
* Set up HTTP client and headers in the provider
Move setup from the metrics client to the HCP telemetry
provider.
* Update the telemetry provider in the HCP manager
Initialize the provider without the HCP configs and then update
it in the HCP manager to enable it.
* Improve test assertion, fix method comment
* Move client provider to metrics client
* Stop the manager on setup error
* Add separate lock for http configuration
* Start telemetry provider in HCP manager
* Update HCP client and config as part of Run
* Remove option to set config at initialization
* Simplify and clean up setting HCP configs
* Add test for telemetry provider Run method
* Fix race condition
* Use clone of HTTP headers
* Only allow initial update and run once
Joshua Timmons