Add changelog fragments

Signed-off-by: Jakub Jelen <jjelen@redhat.com>

Author: Jakuje

docs/changelog-fragments/597.bugfix.rst

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+Fixed log level mapping to cover whole libssh range -- by :user:`Jakuje`.
+
+Previously, it was not possible to set the most verbose libssh ``log`` level
+``SSH_LOG_TRACE`` to get most verbose log messages useful for debugging
+connection issues.

docs/changelog-fragments/597.feature.rst

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+Made libssh use the Python :mod:`python:logging` system -- by :user:`Jakuje`.
+
+Previously, the logging was done by underlying C-code to stderr instead,
+which caused inconsistent behavior.
+
+The default log level is now set to :data:`ANSIBLE_PYLIBSSH_TRACE`
+and donstream loggers are able to trim the verbosity down.
+If you need a performance, you can avoid logging on the libssh
+side at source by setting lower logging value, for example:
+
+.. code-block:: python
+
+   ssh_session.set_log_level(ANSIBLE_PYLIBSSH_NOLOG)
+
+The log level can be now set also through the session constructor:
+
+.. code-block:: python
+
+   ssh = Session(log_verbosity=ANSIBLE_PYLIBSSH_TRACE)
+
+
+or connect() arguments:
+
+.. code-block:: python
+
+   ssh.connect(log_verbosity=ANSIBLE_PYLIBSSH_TRACE)