Remove HttpUtils use in jsp

[scottmarlow]

As per https://www.eclipse.org/lists/jsp-dev/msg00303.html, resolve failure Cannot find symbol HttpUtils in basicSSL.jsp as HttpUtils is removed in Servlet 6.0.

Also remove comment reference to HttpUtils in
[implicitImportHttp.jsp](https://github.com/eclipse-ee4j/jakartaee-tck/blob/master/src/web/jsp/spec/tagfiles/directives/tag20/implicitImportHttp.jsp.

[scottmarlow]

@markt-asf what does String requestURL = HttpUtils.getRequestURL( request ).toString(); need to change to in https://github.com/eclipse-ee4j/jakartaee-tck/blob/master/src/com/sun/ts/tests/integration/sec/secbasicssl/basicSSL.jsp#L53?

[markt-asf]

You can use HttpServletRequest.getRequestURL() but looking at the test it could just use getScheme() and achieve the same result. I'll do a quick PR but note that I can't test this as I'm not set up to run the platform tests, just the individual specs.