broken tests on windows

[jabdr]

Description

I tried to compile and run coraza on windows, which obiously failed.

I know that windows is not a supported platform, but I like to contribute patches to improve the situation. Currently, I am able to pass all tests on windows except those requiring go-ftw (which also does not work on windows). I also ran the tests on linux and the changes did not have any negative impact.

IMHO these patches also improve code quality for other platforms, as they mostly fix incorrect behaviour of not properly closed files and expected behaviour of filepath.Clean/path.Join.

I have created several pull requests to make reviewing easier.

Steps to reproduce

• run windows (or wine?)
• go run mage.go test

Expected result

all tests pass

Actual result

Some tests fail. Mostly because of filesystem behaviour differences.

PR

#1133 fix: broken TestInspectFile on windows
#1135 fix: broken embedio on windows
#1132 fix: broken TestDirectives SecUploadDir on windows
#1134 fix: broken normalisePath/normalisePathWin on windows
#1137 fix: broken mutlipart processor on windows
#1136 fix: broken TestHardcodedIncludeDirectiveDDOS2 on windows
#1138 fix: broken TestConcurrentWriterSuccess on windows
#1139 fix: broken unclosed files on windows