util/ssh: Enable StrictHostKeyChecking SSH option

[onurcelep]

Description
Enables setting StrictHostKeyChecking option for SSH client by introducing LG_SSH_STRICT_HOST_KEY_CHECKING environment variable.

Checklist

• Documentation for the feature
• Tests for the feature

• The arguments and description in doc/configuration.rst have been updated

• Add a section on how to use the feature to doc/usage.rst

• Add a section on how to use the feature to doc/development.rst

• PR has been tested

• Man pages have been regenerated

[jluebbe]

StrictHostKeyChecking is already enabled for connections to exporters. Why would you want to disable that?

[onurcelep]

StrictHostKeyChecking is already enabled for connections to exporters. Why would you want to disable that?

by "Enable" I mean being able to modify it :) In my setup exporter runs on a gateway device paired (1-on-1) with device under test (there is an isolated network between), coordinator also hosted on a separate server. When I try to reach video stream through dockerized exporter it throws strictHostKeyChecking error for exporter host, meaning I would need to add exporter hosts for each pair to my ssh config.