Add wolfSentry integration to echo SSH server example

[miyazakh]

wolfsentry integration to echo SSH server example wolfsentry will filter a ssh client when it enters invalid password continuously.

[cconlon]

Assigning over to @douzzer for review.

[ejohnstown]

@miyazakh @douzzer This PR is a few years stale and needs to be updated to be made ready for review and merge. Your work exists in a branch in your fork of the repo. I am going to close this PR. The PR can be reopened later or you can make a new one. Thank you.