The daqd/nds1 server has a very low connection limit

During the O3 break the LHO control room users ran into nds1 issues. They had hit a limit in the number of live data streams that nds1 would handle at a time.

The short term fix was to close out some other dtt, dataviewer, ndscope sessions.

The issue was traced to how daqd tracks connections and associated buffer usage. It is tracked as a simple bitmask, 1 bit per connection.

The issue here is that the connection limit this enforces is really low.