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Add plaintext client as alternative to SSH. #198

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Add plaintext client as alternative to SSH. #198

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Commits on May 28, 2020

  1. Add plaintext client as alternative to SSH. 

    This offers an alternative to the SSH client currently used during scale
testing.

This instead connects to a server using plaintext and sends commands
this way. It is assumed that a server is running on the server on port 8000
Because ncat is a good example of such a server, the client is called
NCatClient in this change.

The reason for this new method is to eliminate the overhead of
connecting over SSH from the measurements in tests. For reasonably
large-scale tests (~300 nodes) it results in a bout a 7% reduction in
execution time.

One notable difference between this new method and using SSH is that
connections are created per host, rather than per sandbox. This allows
for clients that connect to sandboxes hosted on the same machine to
share the same connection. This has only been tested with tests that
execute serially. Tests that run scenarios in parallel may encounter
issues.

If there is no server listening, and a connection cannot be created, we
fall back to using SSH.
    @putnopvut
    putnopvut committed May 28, 2020
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