ceph-k8s tool improvements

[hunter]

A few things that need improvement in the ceph-k8s script:

• Refactor code into subcommands (eg. ceph-k8s mons create, ceph-k8s osds get
• Deleting/Scaling mons/osds
• Labelling nodes
• Updating config (config secret and injecting)
• Debugging commands (osd tree)
• Adding/taking out specific node disks

[darkcrux]

@hunter should we move ceph-k8s to the medusa repo?

My idea is that the medusa repo would be the one that provisions a deployer box and then puts the script and resources to it. Or maybe a repo of it's own?

[hunter]

Feel free to copy it across. Probably useful to maintain the script in ceph-docker too if/when we contribute upstream