Merge branch 'unify-tunnel-endpoint-parsing' into next

Serhey Popovych  says:

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Use get_addr_rta() helper to unify address retriveal from netlink
message when configuring tunnel and get_addr() to parse endpoint
address into @inet_prefix.

This is next step towards ip and ipv6 tunnel module merge: endpoint
address parsing code will differ only in @family constant being
passed to get_addr_rta() and get_addr().

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Signed-off-by: David Ahern <dsahern@gmail.com>