testutil: make runtests support %include

Using this instruction, a test case can include the contents of a file
into the test during the preprocessing.

Closes #12612

testutil: allow multiple %-operators on the same line

Closes #11303

misc: fix spelling mistakes

Reported-by: musvaage on github
Fixes #11171
Closes #11172

runtests: fix -c option when run with valgrind

The curl binary argument wasn't being quoted properly. This seems to
have broken at some point after quoting was added in commit 606b29fe.

runtests: fix -c option when run with valgrind

The curl binary argument wasn't being quoted properly. This seems to
have broken at some point after quoting was added in commit 606b29fe.

Reported-by: Daniel Stenberg
Ref: #11073
Fixes #11074
Closes #11076

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runtests: support buffering log messages in runner & servers

Log messages generated with logmsg can now be buffered and returned from
the runner as a return value. This will be needed w

runtests: support buffering log messages in runner & servers

Log messages generated with logmsg can now be buffered and returned from
the runner as a return value. This will be needed with parallel testing
to allow all messages for one test to be displayed together instead of
interspersed with messages of multiple tests. Buffering can be disabled
by setting a logging callback function with setlogfunc, which is
currently being done to preserve existing logging behaviour for now.

Some additional output is generated in verbose and debugprotocol modes,
which don't always use logmsg. These modes also impact some servers
which generate extra messages. No attempt is made to buffer everything
if these modes are enabled.

Ref: #10818
Closes #11016

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runtests: refactor into more packages

testutil.pm now contains a few miscellaneous functions that are used in
several places but have no better place to live. subvariables moves to

runtests: refactor into more packages

testutil.pm now contains a few miscellaneous functions that are used in
several places but have no better place to live. subvariables moves to
servers.pm since most variables that it substitutes relate to servers,
so this is the most appropriate place. Rename a few functions for better
naming consistency.

Ref: #10818
Closes #10995

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