tests: Add some missing keywords to tests

These are needed to skip some tests when configure options have disabled
certain features.

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

http: have CURLOPT_FAILONERROR fail after all headers

... so that Retry-After and other meta-content can still be used.

Added 1634 to verify. Adjusted test 194 and 281 since --fail

http: have CURLOPT_FAILONERROR fail after all headers

... so that Retry-After and other meta-content can still be used.

Added 1634 to verify. Adjusted test 194 and 281 since --fail now also
includes the header-terminating CRLF in the output before it exits.

Fixes #6408
Closes #6409

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