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

Align the three variants of Remote.pm.

Make the perl modules consistent for the multiple regression tests.
This includes coding style, better error messages and variable
naming.

Fix dryrun for remote relayd test.

Fix the relayd regression tests. Now they pass with and without
an obj directory. The relayd process can also run on a remote
machine for different timing.

Sync relayd tests with socket splicing tests.

Allow the relayd regression tests to run the relayd on a different
host from client and server. Real TCP connections not running on
localhost provide a different timing uncovering more bugs.