Set metric kind and value type when sending metric values
Set metric kind and value type when sending metric values

This makes sure that metric descriptors created implicitly by
Stackdriver have correct kind and value type.

Descriptors might be created implicitly after they are removed manually
using the Stackdriver API.

cloudfoundry-community/stackdriver-tools,cloudfoundry-community/stackdriver-tools,cloudfoundry-community/stackdriver-tools,cloudfoundry-community/stackdriver-tools