curl_url_set: reject spaces in URLs w/o CURLU_ALLOW_SPACE

They were never officially allowed and slipped in only due to sloppy
parsing. Spaces (ascii 32) should be correctly encoded (to

curl_url_set: reject spaces in URLs w/o CURLU_ALLOW_SPACE

They were never officially allowed and slipped in only due to sloppy
parsing. Spaces (ascii 32) should be correctly encoded (to %20) before
being part of a URL.

The new flag bit CURLU_ALLOW_SPACE when a full URL is set, makes libcurl
allow spaces.

Updated test 1560 to verify.

Closes #7073

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tests: use %TESTNUMBER instead of fixed number

This makes the tests easier to copy and relocate to other test numbers
without having to update content.

Closes #6738

mqtt: handle POST/PUBLISH without a set POSTFIELDSIZE

Detected by OSS-Fuzz
Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28735

Added test 1916 and 1917 to verify.

mqtt: handle POST/PUBLISH without a set POSTFIELDSIZE

Detected by OSS-Fuzz
Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28735

Added test 1916 and 1917 to verify.

Closes #6338

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