UUID use in partitioner #441
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This has been refactored in preparation for modifying the cluster config command to use the partition UUID instead of encoding the device path directly.
Because certain cloud providers don't guarantee that devices will enumerate in
a consistent order, use the PARTUUID instead of the device when working with
partitions.
This will result in an aerospike namespace config that looks like this:
```
namespace test {
default-ttl 0
index-type flash {
mount /mnt/05f452fc-e059-4f0f-aad7-ece9b0528f51
mount /mnt/7b484aac-6166-49c9-b710-6c165cbf9a52
mount /mnt/aa9e5735-0840-403e-b5d4-06fff5f63313
mount /mnt/15d84ea5-4f58-415f-a275-eef72ef8f927
mounts-budget 279340646K
}
partition-tree-sprigs 8192
replication-factor 2
sindex-type flash {
mount /mnt/15f452fc-e059-4f0f-aad7-ece9b0528f42
mount /mnt/6b484aac-6166-49c9-b710-6c165cbf9a42
mount /mnt/3a9e5735-0840-403e-b5d4-06fff5f63338
mount /mnt/85d84ea5-4f58-415f-a275-eef72ef8f919
mounts-budget 279340646K
}
storage-engine device {
device /dev/disk/by-partuuid/7b3398e7-2c44-4d1e-a9d4-d8a7306f0981 /dev/disk/by-partuuid/85244191-e8ff-4efa-8e01-becde33901f0
device /dev/disk/by-partuuid/89856114-3dec-44d8-8516-7453ddc2cf54 /dev/disk/by-partuuid/8439ce70-c9dc-4c1d-a49d-0a516e7e37bc
device /dev/disk/by-partuuid/7319fe45-bc39-41a8-b584-b1a939b292f6 /dev/disk/by-partuuid/d6ad47e0-31ae-4c23-b705-a4d861a2b6d3
device /dev/disk/by-partuuid/7844dbd3-ab9a-4c0e-a45e-5a2fbe8cb76e /dev/disk/by-partuuid/c79f2053-6d7a-4c87-aa65-3d252ad34dc6
device /dev/disk/by-partuuid/cbac86d4-339b-462c-9d2a-afe074918c19 /dev/disk/by-partuuid/024b50a1-b05f-448d-8c85-131e8cd8b487
device /dev/disk/by-partuuid/0beb84fa-ec6a-4988-a4e6-e03d26ae9af8 /dev/disk/by-partuuid/aa7e38f5-f897-4b13-9154-65f271d4acbc
device /dev/disk/by-partuuid/78bc332c-7921-45d9-8372-5cd7de749936 /dev/disk/by-partuuid/654b64b3-1d2d-4a1e-9af1-8c05939acefd
device /dev/disk/by-partuuid/94b5c2c9-9814-4c2b-8dde-43d7a97c2191 /dev/disk/by-partuuid/650042f6-96ef-4692-8236-38deabdf0765
}
}
```
Use PARTUUID for cluster partition commands
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