With current default number (1024) i am not able to spawn all required for
e2e tests kube-system containers. I had problems with heapster replicas, and
it was obvious from kube-scheduler logs that it is in Pending exaclty because of
insufficient memory.

To reproduce:
1. KUBERNETES_PROVIDER=vagrant ./cluster/kube-up.sh
2. Run any e2e test

Change-Id: I963347e86c7129607f07ce1cea8cc0b536b09b72