static-file: properly set/use cache header for static file (closes #2255013) This changesets enables the standard http cache mechanism where the static controller may reply "304 Not modified" based on `last-modified` in HTTP response and `if-modified-since` in HTTP query. The last modified time is computed using the file-system information. The pre-existing logic using an `Expires` header to prevent client from sending request stay in place. The new logic just prevents sending the file again if not necessary.

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[MESSAGES CONTROL]

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disable-msg = C0301

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[VARIABLES]

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# Enable / disable this checker

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enable-variables = yes

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additional-builtins = _, display_name

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[BASIC]

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required-attributes=

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attr-rgx = (w|[a-z_][a-z0-9_]{2,30})

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variable-rgx = (w|[a-z_][a-z0-9_]{2,30})$

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argument-rgx = (w|[a-z_][a-z0-9_]{2,30})$

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[TYPECHECK]

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generated-members=debug,info,notice,warning,error,critical,exception