Add support for cephx authentication for Ceph storage backends

[zenntrix]

Whilst it is possible to create a pve_storage that points to an ceph rbd:

pve_storages:
  - name: vm-storage
    type: rbd
    content:
    - images
    - rootdir
    pool: vm-storage
    username: admin
    monhost:
    - proxmox-test.corp.zenntrix.com:6789
    - test-box.corp.zenntrix.com:6789
pve_ceph_pools:
  - name: vm-storage
    pgs: 64
    application: rbd
    storage: true
    rule: hdd

It is inaccessible due to the keyring not being created. I have only tried this with cephx, i believe it wouldn't be a problem without it.

[zenntrix]

Has anyone else identified this issue as well? Just to make sure that i am not missing anything else.

[lae]

There's no logic for creating the keyring, that's correct. You kind of have to do it yourself when configuring it manually, anyway. We can add support for specifying and installing a keyring, though.

https://pve.proxmox.com/pve-docs/chapter-pvesm.html#_authentication