CTRL: Add CTRL cmd introspection to print documentation
We possibly want something similar to what we already have for VTY cmds and rate_ctrs, but applied to CTRL cmds.
- Add a VTY cmd (or extend "show online-help" or "show asciidoc") to extract a list of commands with information about which node they are in and which parameter do they have.
- Add support for this command into osmo-python-tests/osmo_interact_*.py
- Have that output feeded into the userManual.
- Add CI checks in contrib/jenkins.sh for projects so that gerrit verifies that a commit doesn't leave the saved .xml/asciidoc file out of date.
Last, we want to have some