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01420b2db5
Previously, we did not set lifetime for redirect route, and redirect routes were removed only when received a RA from the target address. Thus, routes that redirect on-link addresses were never removed. RFCs mention nothing about the lifetime of redirection. But the previous implementation does not pass the IPv6 Core Conformance Tests. This makes - remember all received RAs and manage them by the sender address (previously, remembered only one with the highest preference), - then use the router lifetime as one for redirect route, - remove redirect route also when the router corresponds to the sender address is dropped (previously, considered only target address). Note, even if we recieve a new RA, we do not update existing redirect routes. The lifetime of the redirect route is updated only when a new Redirect message is received. Closes #32527.