don't autogenerate a URN for resources which don't provide one

[chaos@bbn.com]

The code:

for datapath in info['datapaths']:
  print "datapath=%s" % datapath
  resource[datapath] = gmoc.Resource(
                         datapath,
                         type = 'datapath',
                         pop = pop,
                         operator = organization,
                       )
  print "resource.id=%s" % resource[datapath].id

yields:

datapath=04:4d:00:12:e2:b8:a5:d0
resource.id=urn:publicid:IDN+gmoc.geni.net+node+04:4d:00:12:e2:b8:a5:d0
datapath=04:4d:00:26:f1:3f:3b:00
resource.id=urn:publicid:IDN+gmoc.geni.net+node+04:4d:00:26:f1:3f:3b:00

Resources should be defined in the namespace of the aggregate/campus which owns them, and i think it is a rare case that we will want to put a resource in the gmoc.geni.net namespace. The default should be to throw an error if the caller doesn't provide a URN, not to invent one in the gmoc.geni.net namespace.

[chaos@bbn.com]

This code:

for datapath in info['datapaths']:
  print "datapath=%s" % datapath
  resource[datapath] = gmoc.Resource(
                         datapath,
                         type = 'datapath',
                         pop = pop,
                         operator = organization,
                       )
  print "resource.id=%s" % resource[datapath].id

now yields:

datapath=04:4d:00:12:e2:b8:a5:d0
resource.id=04:4d:00:12:e2:b8:a5:d0
datapath=04:4d:00:26:f1:3f:3b:00
resource.id=04:4d:00:26:f1:3f:3b:00

which is probably fine for now.