Disallow client_body_buffer_size annotation from location /

[diazjf]

Currently when the client_body_buffer_size is set it configures all locations in the rules as well as location /. This will disallow client_body_buffer_size from being configured in / when it is not present in the rule.

[k8s-reviewable]

This change is 

[diazjf]

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ok-ingress
  annotations:
    ingress.kubernetes.io/client-body-buffer-size: 5k
spec:
  tls:
  - hosts:
    - ok.com
  rules:
  - host: ok.com
    http:
      paths:
      - path: /tea
        backend:
          serviceName: tea-svc
          servicePort: 80

produces https://pastebin.com/wPrVt9ZY only configuring /tea.

[diazjf]

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ok-ingress
  annotations:
    ingress.kubernetes.io/client-body-buffer-size: 5k
spec:
  tls:
  - hosts:
    - ok.com
  rules:
  - host: ok.com
    http:
      paths:
      - path: /tea
        backend:
          serviceName: tea-svc
          servicePort: 80

sets client_body_buffer_size to 5k to just location /.

[coveralls]

Coverage remained the same at 44.442% when pulling c61eb33 on diazjf:remove-size-setting-from-default into ed3803c on kubernetes:master.

[diazjf]

fix already applied in #1233