Add entity.guid to the front of the agent control health file

[kaylareopelle]

Update the primary entity guid received in the connect response field to be the first field in the health file.

Details: https://source.datanerd.us/agents/agent-specs/pull/752 (internal)

Be aware that the current HealthCheck is initialized before we have a connect response. Things may need to be reworked.

[Newrelic-Boomi]

https://new-relic.atlassian.net/browse/NR-479021