ascanrules: Merge XSS detection logic of CrossSiteScriptingScanRule and PersistentXssScanRule #3872
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Both CrossSiteScriptingScanRule and PersistentXssScanRule need the same logic to detect the existence of an XSS only differing on the the HTTP request where the reflection is checked. At the moment stored XSS rule is not receiving all the upgrades and fixes the reflected XSS rule is receiving, this solves the problem and removes duplicated code.
Once Fix stored xss scanner is used the FPs on stored XSS start to appear.