[pve-devel] unify storage scan API, complete separating local hardware list

[Thomas Lamprecht]

Finishes the thoughts we had two years ago[0], add usb endpoint in the existing
hardware/ api directory, along side PCI, and use it. This then allows
sunsetting the one in the storage scan api (which never should have been added
there in the first place), and unifying of the pvesm CLI and API definitions,
which had already some small minor fixes applied only in one side of the copy.

IMO, this issues stem mostly from a misunderstanding what pve-storage should be,
i.e., an access API for existing storages, not a management one for creating or
changing the underlying storages or devices.

[0]: https://lists.proxmox.com/pipermail/pve-devel/2018-November/034694.html