Once a webfile is cached, it can be accessed over any 'anti-cache' value

Although most likely not that much impact otherwise than confusing, the WebFileValve currently serves a webfile possibly over incorrect anti-cache values.

For example if I try to fetch

http://localhost:8080/site/webfiles/14815XXX18537/css/bootstrap.css

it returns a 404, but if I first fetch

http://localhost:8080/site/webfiles/1481518537/css/bootstrap.css

where '1481518537' is the correct anti-cache value, then after that call,

http://localhost:8080/site/webfiles/14815XXX18537/css/bootstrap.css

does return the bootstrap.css. That is because the cachekey does not contain the version any more since HSTTWO-3682. When we fix this, we must make sure that supporting fetching webfiles over a URL without anti-cache value keeps working!