Issue 19684: Make test fail.

Test for Request #19684 - Redirects containing spaces do not work

- Test added.
- Assert pass: Is absolute URI (Net_URL2::isAbsolute())
- Assert pass: URI is not modified, space preserved (Net_URL2::__toString())
Issue 19684: Make test pass.

This fix is pretty lightweight. Because of the transition
between RFC 1738 and RFC 3986 there are possible more
characters out of the reserved and unreserved range
(or no reserved purpose) that could be taken care of
here.
Issue 19684: Make test pass (better).