Ban SV peers by checking the user agent string
Ban SV peers by checking the user agent string

While this is not entirely the best thing we could do it does prevent
current SV peers from connecting and filling our orphan cache. A longer
term solution would be to use a new service bit but that would
require a multi implementation co-ordination which would take a while
to implement. But at least for the short term the current solution
offers immediate relief from the barrage of orphans we sometimes
receive.

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