Disable kernel RA earlier on Linux
* Don't set if_up or if_down as true when testing
* ra%d_prefix is now a space separated array of the finished address/len
* If we fail to open sockets, don't bother sending the request
* Send our NS solicitation directly to the router
* Change the NS times so that we assume reachable until the reachable time
expires, then send probes at retrans intervals until
DELAY_FIRST_PROBE_TIME is reached at which point we expire the router
* Remove -v from --version in usage
* Only add our own host or destination routes to the build table when we
are adding gateways
* Ensure we have correct memory allocation for each prefix in the RA
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