Currently, delete returns an error if a resource is not found.
That is a bit confusing because if you delete something that
is not found, the end state is not really an error. The end
state is what you wanted to do in the first place. This type
of error is not propogated from the kube client but it is logged
in tiller. We could also change this to keep returning errors
(even the not found) and filter it out in the release server.
This commit adds an Update function to the client.
The Update function takes in the modified manifests and
the original manifests. It then iterates through the modified
objects, creates objects not found in kubernetes, and updates
objects that exists but have been modified. Finally, it
iterates through the original resources and checks to see if
they have been deleted in the modified configuration and then
proceeds to delete them. #690