Allow HTTP clients to be cancelled by passing along context #565
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This replaces all calls of "http.NewRequest" with
"http.NewRequestWithContext", to ensure that the HTTP client stops what its doing immediately when the context gets canceled.
The main motivation here is to better handle network connectivity problems to the pganalyze snapshot API, which otherwise make it seem like the collector hangs when trying to cancel a test run with CTRL+C (SIGINT).