Bump cluster autoscaler to 0.5.1

Cluster-autoscaler: bump version to 0.5.0

Merge pull request #1990 from kubernetes/foxish-feature-freeze-1

Feature freeze 1.5 PR

Merge pull request #1721 from Wattpad/aws-ca-bug-instance-not-in-know…

…n-group

AWS Cluster Autoscaler: NodeGroupForNode should return nil if instance is not in any known ASG

Merge pull request #1301 from mwielgus/add-null-handling-for-migconfigs

Cluster autoscaler: add handlign for nill mig configs (in case not all l node pools are autoscaled)

Merge pull request #1001 from stephenrlouie/common_vars

refactor common

Merge pull request #1203 from eparis/yellow-e2e-status

Display when the test are 'yellow'

Merge pull request #850 from simonswine/feature-ssl-redirect

ingress: adds configurable SSL redirect nginx controller

Merge pull request #647 from bprashanth/ing_docs

Clarify firewall rule doc.

Merge pull request #403 from eparis/whitelists

[submit queue] Update manual whitelists