Reduce client errors when servers overloaded #73
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When Scalyr's servers are overloaded, they return a combination of "too
busy" HTTP responses and internal errors, both of which result in
ERROR-level log messages in the agent log.
This commit adds explicit checking for the specific error message that
accompanies internal errors when the servers are too busy, and
downgrades the log messages to warnings since the agent retries
automatically and no human intervention is required.