Add very hacky global_policies test to use for NSDI deadline. To
support NSDI06 easily, we want to create a project called NSDI06, have anyone who has an NSDI deadline join that project, and use that membership to allow them to swapin experiments in their real projects. So, new global_policies entry format: insert into global_policies values ('membership', 'emulab-ops,testbed,NSDI06', 'eq', 0); When this policy is inserted, only members of the comma separated list of projects names can swap in *any* experiments. Just remove the table entry to remove the retriction.