Fixes model.py such that api call node_delete deletes OBM info along with the node.
Fixes model.py such that api call node_delete deletes OBM info along with the node.

kylehogan/haas,meng-sun/hil,henn/haas,CCI-MOC/haas,kylehogan/hil,meng-sun/hil,kylehogan/hil,henn/hil,SahilTikale/haas,henn/hil_sahil,henn/hil_sahil,henn/hil