Replace deprecated given/when and smartmatch operator in Perl scripts.

Replace deprecated IO::Socket::INET6 with IO::Socket::IP.

Do not mix Perl read() with sysread(). Data could get stuck in the
buffered IO and test run-regress-args-get-1073741824.pl would fail
on slow hardware. Introduce a common function read_part() that

Do not mix Perl read() with sysread(). Data could get stuck in the
buffered IO and test run-regress-args-get-1073741824.pl would fail
on slow hardware. Introduce a common function read_part() that
uses Perl read(). Limit debug output to one line per 1% of data.
Remove unused function http_server(). Fix whitespace. Cleanup
Makefile.

show more ...

Add Range and multipart tests.

Fix some Perl statements perlcritic was bitching about: Variable
declared in conditional statement.

whitespace, no functional change

Print the received percentage in client.log instead of dots.
This makes it nicer when waiting for large test files.

Use sysread instead of <STDIN> for the stream.

Remove my copyright here

Add httpd regression tests based on bluhm's regression suite for
relayd - "bluhm test". This is just the initial version, more tests
and changes will be done.

As discussed with bluhm@ florian@