Some with* missing self +

[DustinChaloupka]

Unsure if this is intended or not, but from what I would expect with a with* field, it would take the current object and add a field. However, there are some that are missing the self +, so they create a new object with only the field that was called. For example:

A container livenessProbe mixin I would expect this:

  container.mixin.livenessProbe.httpGet
  .withPath('/healthz')
  .withScheme('HTTP')
  .withPort(10254)

to generate:

                         "livenessProbe": {
                           "httpGet": {
                              "path": "/healthz",
                              "scheme": "HTTP",
                              "port": 10254
                           }
                         }

But it instead just generates:

                         "livenessProbe": {
                           "httpGet": {
                              "port": 10254
                           }
                         }

Along the same lines, if withPort is called before either of the others, jsonnet complains with an error:

RUNTIME ERROR: field does not exist: withScheme
	x.jsonnet:(38:3)-(41:14)	thunk <container>
	x.jsonnet:45:55-74	thunk <array_element>
	k8s.libsonnet:607:118-128	object <spec>
	k8s.libsonnet:540:59-72	object <anonymous>
	k8s.libsonnet:458:61-82	object <spec>
	k8s.libsonnet:403:39-52	object <anonymous>
	x.jsonnet:49:3-23	thunk <array_element>
	k.libsonnet:60:59-74	object <anonymous>
	During manifestation

As a workaround, the following does generate the correct output:

  container.mixin.livenessProbe.httpGet
  .withPath('/healthz')
  .withScheme('HTTP') +
  container.mixin.livenessProbe.httpGet
  .withPort(10254) +

This is the livenessProbe section with the fields:

                  // Path to access on the HTTP server.
                  withPath(path):: self + __httpGetMixin({path: path}),
                  // Name or number of the port to access on the container. Number must be in the range 1 to 65535. Name must be an IANA_SVC_NAME.
                  withPort(port):: __httpGetMixin({port: port}),
                  // Scheme to use for connecting to the host. Defaults to HTTP.
                  withScheme(scheme):: self + __httpGetMixin({scheme: scheme}),

Which is from the precompiled ksonnet.beta.3 file.