This updates the prometheus-process-exporter chart to include the pod
security context on the pod template. This changes the pod's
user from root to the nobody user instead
This also adds the container security context to set
allowPrivilegeEscalation to false and readOnlyRootFilesystem to true
Change-Id: I623227f9f9c878a8e7745f46f2cc77f6904005fb
4999508454