Add fields to apache access log
Add fields to apache access log

Add requestTimeMicro (the time a request took in microseconds) and
requestPath (the request path without the query string) to the apache
access logs.

requestPath is useful for metric filters againt a specific page.

requestTimeMicro is justified here
https://github.com/alphagov/digitalmarketplace-api/commit/9ec62be7f51997e7876e056bbb0236fc6fee5f7e

https://httpd.apache.org/docs/2.2/mod/mod_log_config.html#formats

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