Make a copy of node object (#335)
Make a copy of node object (#335)

Since the value is modified by gossip, make a copy under lock.
If not enumerate returns the original and can cause concurrent read-write error.
libopenstorage/openstorage,libopenstorage/openstorage,pault84/openstorage,libopenstorage/openstorage,pault84/openstorage,pault84/openstorage