In Rocky release, the k8s workers security group was wide opened but
in Stein release it is more restrictive which prevent the access of
Kubnertes dashboard(and other serivces) via the command:
$ kubectl proxy
This patch can fix it by allowing traffic from master security group
to workers security group.
Co-Authored: Feilong Wang<flwang@catalyst.net.nz>
Task: 30171
Story: 2005294
Change-Id: I546cd7324b87b267e945477c78539ea80534538f
1f5dc1aa91