Add SSL-only "arpinfo" command to return MAC/IP for servers and "peer" nodes.
Details: Return MAC/IP (ARP) information for a node's "peers" on the node control net. We also return info for the control net gateway (if there is one) and any servers on the node control network (e.g., subbosses). As far as "peer" info, right now we just support calls by subbosses that will return the info for the set of nodes they control. This could also be used by experiment firewalls or gateways to return info for the nodes they are protecting and setup filters accordingly. Note that this call only returns info if invoked using SSL. This allows the client to be sure it is getting the info from boss. Tangentially related, is the addition of an index to the subbosses table to speed up a really slow query.
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