fix issue 85: podSecurityContext

[discostur]

• since the pod drops all capabilities on start it has no rights to use ping / icmp

The user running cloudflared process has a GID (group ID) that is not within ping_group_range

• added the correct sysctl settings for both helm charts via default values.yaml
• fixed cloudflare-tunnel-remote since the podSecurityContext was not applied in deployment.yaml

[discostur]

fixes https://github.com/cloudflare/helm-charts/issues/85

[discostur]

@obezuk @larcher @uhthomas could you please look at this and the other open pull requests and draft a new release? would be great to give some love back to these helm charts ;)

Thanks