Revert "Merge branch 'fake'"

This reverts commit 2558f4dc3226c29e815336b572e540772f10ec8a, reversing
changes made to 84d92f1172c2fbc0afda530a65245392f0c107eb.
Revert "Revert "Revert "Added fake SSH server to test command execution via the ParallelSSHClient. Added ParallelSSHClient tests"""

This reverts commit 84d92f1172c2fbc0afda530a65245392f0c107eb.