check_ssh: patches from op5 (#1738)

* check_ssh: properly parse a delayed version control string

This resolves an issue with SSH servers which do not respond with their
version control string as the first thing in the SSH protocol version
exchange phase after connection establishment.

This patch also makes sure that we disregard a potential comment in the
version exchange string to avoid nonsense mismatches. In the future, we
might want to add the capability to match against a user specified comment.

In addition, the patch largely improves the communication towards the
server, which adds better protocol adherence.

Of course, new test cases are added to support the trigger and guard
against regressions of the bugs solved by this patch.

This fixes op5#7945 (https://bugs.op5.com/view.php?id=7945)

Signed-off-by: Anton Lofgren <alofgren@op5.com>

* check_ssh.t: Fix a few typos

Signed-off-by: Anton Lofgren <alofgren@op5.com>

* check_ssh: Handle non-alpha software versions

This patch fixes a bug where we would reject version control strings
that do not contain letters, because the assumption is made that they
always do. This is not required by the RFC however, and there exist
implementations that do not contain letters.

I've also added a few references to the RFC to make the process of
parsing the control string more apparent.

This fixes op5#8716 (https://bugs.op5.com/view.php?id=8716)

Signed-off-by: Anton Lofgren <alofgren@op5.com>

* check_ssh: Fix a typo in "remote-protocol parameter

remote-protcol -> remote-protocol

Signed-off-by: Anton Lofgren <alofgren@op5.com>

* Remove unused variable

* Formating fixes

* Update translations

* Remove merge conflict artefact from previous merge

* Set fixed include paths

* Improve code style to be slightly more readable

* Update test cases for different netcat behaviour and reduce sleep time

---------

Signed-off-by: Anton Lofgren <alofgren@op5.com>
Co-authored-by: Anton Lofgren <alofgren@op5.com>

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