Better handle sdap_handle memory from callers.

Always just mark the sdap_handle as not connected and let later _send()
functions to take care of freeing the handle before reconnecting.

Introduce restart functions to avoid calling _send() functions in _done()
functions error paths as this would have the same effect as directly freeing
the sdap_handle and cause access to freed memory in sdap_handle_release()

By freeing sdap_handle only in the connection _recv() function we
guarantee it can never be done within sdap_handle_release() but only
in a following event.

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