Brandon Philips 9216057589 kubectl: add less verbose version ...

The kubectl version output is very complex and makes it hard for users
and vendors to give actionable information. For example during the
recent Kubernetes 1.4.3 TLS security scramble I had to write a one-liner
for users to get out the version number to give to figure out if they
are vulnerable:

    $ kubectl version | grep -i Server | sed  -n 's%.*GitVersion:"\([^"]*\).*%\1%p'

Instead this patch outputs simply output with `--short`

    ./kubectl version --short
    Client Version: v1.4.3
    Server Version: v1.4.3

2016-11-10 14:07:42 -08:00

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