Fixes #6919, do not check for host in regex group in log importer if format has no regex. Also add nginx json log to log importer system test.

fixed some system tests. the order change of some device reports changed as they have sometimes same orderid and as we moved some ecommerce reports it results in a different order now

fix tests as reports are invalidated now in some tests causing the site creation date to change causing archiving more dates

fixed some integration tests. for example sometimes a converted goal was listed before the actual pageview

Fixing build for merge and move IIS check for --w3c-time-taken-milli to Parser.check_format so only one warning outputted.

Adding support for parsing amazon cloudfront log files in log importer & making W3cExtendedFormat treat time-taken field as seconds by default (since that is what the W3C format specifies). Also add support for event tracking and cloudfront RTMP logs (which provide event logs). Also allow multiple spaces in between W3C extended log files. Allow derived classes of W3cExtendedFormat to define new custom field regexes.

Do not create new visit if no referrer info in current action, but referrer info present in last action. Also add integration + system tests for new behavior.