for "bgpctl neighbor foo up/down/clear", make bgpctl not exit after sending

the request, but wait for the new IMSG_CTL_RESULT message, which contains
a status code to indicate wether the request was processed successfully
or wether an error occured and if so what kind of error.
no more "IMSG_CTL_NEIGHBOR_ with unknown neighbor foobaz" in the log
when you mistyped foobar - no bgpctl itself complains
claudio ok

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