ripd: retrofit the 'redistribute' commands to the new northbound model

ripd: retrofit the 'redistribute' commands to the new northbound model

Trivial conversion. As usual, combine multiple DEFUNs into a single
DEFPY for simplicity.

As a bonus of the northbound conversion, this commit fixes the
redistribution of certain protocols into ripd. The 'redist_type' array
used by the "redistribute" commands was terribly outdated, which was
preventing the CLI to parse correctly certain protocols like isis
and babel.

Remove the route_map hooks installed by rip_route_map_init() since they
were redundant (rip_init() already takes care of that).

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>