Add changelog fragments for PR 756

Author: justin-stephenson

docs/changelog-fragments/756.feature.1.rst

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+Added a ``pylibsshext.session.connect()`` parameter
+``open_session_retries`` -- by :user:`justin-stephenson`.
+
+The ``open_session_retries`` session ``connect()``
+parameter allows a configurable number of retries if
+libssh ``ssh_channel_open_session()`` returns ``SSH_AGAIN``.
+The default option value is 0, no retries will be
+attempted.

docs/changelog-fragments/756.feature.2.rst

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+Added a ``pylibsshext.session.connect()`` parameter
+``timeout_usec`` to set ``SSH_OPTIONS_TIMEOUT_USEC``.
+
+This allows setting the ``SSH_OPTIONS_TIMEOUT_USEC``
+ssh option, though ``SSH_OPTIONS_TIMEOUT`` is a more
+practical option.
+
+-- by :user:`justin-stephenson`