Delete local data on drain if pods have volumes

[rogeruiz]

Seeing this from CloudWatch whenever we try to drain minions with pods on them that have local data.

error: pods with local storage (use --delete-local-data to override): some-pod, another-pod

[jmcarp]

Remind me why pods need local data?

[LinuxBozo]

They don't. That's the point. But, in the case they do have any (say, a redis cluster that hasn't actually been configured for persistent volumes yet), we want to make sure they get nuked properly on drain.

[rogeruiz]

Taking a further look at this too, we use local data for the binaries we ship with 18fgsa/redis-sentinel-init and 18fgsa/redis-server-init. We mount the /opt directory for the initContainers and add the configuration and bootstrap scripts in there.