Automatic merge from submit-queue

re-organize development.md 

Addresses issue #13876; reorganizes and cleans up parts of development.md; splits out the godep section for managing `vendor/` tree dependencies into a new godep.md file.

```release-note
The developer guide has been reorganized to facilitate the majority of new developers working on Kubernetes.
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Signed-off-by: Mike Brown <brownwm@us.ibm.com>