Add storage.yaml

[masaori335]

Address #10766. Implementation of merging storage.config and volume.config into storage.yaml. Docs will be changed by #11000.

TODOs

• Test with raw disks
• Decouple cleanups

[masaori335]

1. Rebased on the latest 11-Dev branch (4274bc0).
2. Tested with raw devices on Linux. This generated the same result (total cache size and related debug messages) as before this change.

storage.config and volume.config without this PR

# storage.config
/dev/disk/by-path/AAAA volume=1
/dev/disk/by-path/BBBB volume=1
/dev/disk/by-path/CCCC volume=1
/dev/disk/by-path/DDDD volume=1
/dev/ram0 volume=2

# volume.config
volume=1 scheme=http size=100%
volume=2 scheme=http size=10485760000

storege.yaml with this PR

# storage.yaml
cache:
  spans:
    - id: "disk-1"
      path: /dev/disk/by-path/AAAA
    - id: "disk-2"
      path: /dev/disk/by-path/BBBB
    - id: "disk-3"
      path: /dev/disk/by-path/CCCC
    - id: "disk-4"
      path: /dev/disk/by-path/DDDD
    - id: "ram-1"
      path: /dev/ram0      
  volumes:
    - id: 1
      spans:
        - use: disk-1
        - use: disk-2
        - use: disk-3
        - use: disk-4
    - id: 2
      spans:
        - use: ram-1

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