Select server for nds transfer based on time of the data

Created by: areeda

Data at the sites LLO/LHO are archived to tape after about a month, perhaps 3 weeks. Data can take hours to retrieve from tape if multiple people are using it.

LDR sometimes gets behind so while data usually arrives at CIT in 10 minutes, we seen it take a week when something nasty happens.

A solution, or at least improvement would be to have the choice of server to try first depend on the age of the data being requested. A good cut-off value seems to be 2 weeks. If the data is older than that NDS2 server at CIT should be preferred over the server at the appropriate observatory.