This change removes NovaObjectDictCompat from the ComputeNode object.
The only changes needed were changing dict syntax over to either use
dot syntax or getattr/setattr. In cases where the dict function update()
was used, the update dictionary was unchanged, but was not passed into
a new update helper function that applies the updates using setattr() on
the given kwargs.
Change-Id: Iba5303d23492db55f46df8b8f6b3dbae5b4971c1
Partially-Implements: bp rm-object-dict-compat-newton
8806ac9e41