Add the ability to control the exporter webserver address used #56
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Prior to this change, start_http_server was called without explicit addr parameter, defaulting to prometheus_client addr="0.0.0.0"
For some reason (security), one might want to use a different address (127.0.0.1 for example)
This PR optionally allows setting bind address by setting the METRICS_ADDR environment variable
For backward compatibility the default value is kept "0.0.0.0"