Fix for the problem of not setting default values when inserting experiment table rows after a parse. It used to be that slots that were not explicitly given values by the parser would be left as whatever they were in the DB. Now I get the default values by doing a "describe experiments" query, inserting those values for any slot that is not set by the parser.
Fix for the problem of not setting default values when inserting
experiment table rows after a parse. It used to be that slots that
were not explicitly given values by the parser would be left as
whatever they were in the DB. Now I get the default values by doing
a "describe experiments" query, inserting those values for any slot
that is not set by the parser.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome