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: #10818Closes#11016
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: #10818Closes#10995
