Change the default Pull policy to PullIfNotPresent.
Merge pull request #2360 from dchen1107/cleanup

Change the default Pull policy to PullIfNotPresent.
rename kube server binaries to kube-

apiserver becomes kube-apiserver
controller-manager -> kube-controller-manager
scheduler and proxy similarly.

Only thing I promise is that right now hack/build-go.sh and
build/release.sh exit with 0.  That's it.  Who knows if any of this
actually works....