Revert "Remove references to scheduler from pod storage."

This reverts commit 98ef76c164c2553e984da7e05bc82c4697d8b4ac.

Conflicts:
	pkg/master/master.go
Revert "Remove synchronous assignPod call from create pod"

This reverts commit 29e9e13188eb04a5161957e37dde92f94a3d8d4d.

Conflicts:
	pkg/registry/etcd/etcd.go
	pkg/registry/pod/storage.go