replace monitor_cb by raft state_cb. #543
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The state_cb is called immediately after raft's state changes, while the
monitor_cb was polling every loop iteration. This led e.g. to bugs where
raft was assuming no longer being the leader while dqlite's state was not
properly reflecting that.
Fixes #541 , also please refer to that issue for the problem description. Issue observed was similar as in #355.
Relies on functionality introduced by canonical/raft#488.