software/rapid-cdn: Implement frontend log
The access log is useful for usual analysis, but CDN has to provide deep metrics regarding each request, thus implement the frontend log, which follows more or less HAProxy's httplog http://docs.haproxy.org/2.6/configuration.html#option%20httplog and can be correlated with a timestamp to access log. The URI string is dropped from the frontend log, as it's already supported by the access log. Thanks to this it's safe to use !!! (triple exclamation mark) to split the log line, as those characters are not expected to be found in usual metrics provided by HAProxy.
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