Calling sshCommand forces the allocation of PTY, however running commands on servers where there is no proper PTY support (win32-openssh) can generate failures such as garbage output, ...

Being able to disable/enable PTY allocation would help for these environments

EDIT: 

There is PTY setting at the remote level, but actually not sure why I had to make it true at the command level, I think it needs to be defaulted false as there is no impact for LINUX boxes either way, I have tested it. Made a PR.

And this PTY is also applicable for other steps, so instead it is good to have it at the remote level.