Switch to the command as an array format when passing the port
forwarding ssh command to spawn to switch to execution of the ssh
process directly instead of being executed by the default shell.
Fixes: #1467
Multi machines environments will result in collisions until auto
correction is implemented. Therefore invert to keep the forwarding of
the default ssh port disabled by default initially until can handle the
port collisions detection and resolving.
Relates: #1012
Provides an option to disable the forwarding in case it causes issues.
However based on original PRs adding the forwarded behaviour, it does
not appear to be intentional to exclude it permanently.
Closes: #1011Closes: #1012
Adds some basic unit spec tests to validate the main behaviours around
the port forwarding to allow for subsequent behaviour changes.
Additionally removes the dependency on the instance variable @env for
internal functions to allow testing some of the internal functions
without needing to inject an instance variable that is not set on
initialization.
Includes a file contents matcher lifted from the cucumber/aruba project
on github, with some minor modifications instead of including the entire
gem.
