Fix for parsing Disk.fromLsblk on older Linux

[filipsky]

lsblk in Ubuntu 18.04 (in WSL) returns all data as strings.

changed parsing of bool and int properties to work on this format, too

{
  "blockdevices": [
    {
      "name": "/dev/sda",
      "kname": "/dev/sda",
      "maj:min": "8:0",
      "fstype": null,
      "mountpoint": null,
      "label": null,
      "uuid": null,
      "parttype": null,
      "partlabel": null,
      "partuuid": null,
      "partflags": null,
      "ra": "128",
      "ro": "1",
      "rm": "0",
      "hotplug": "0",
      "model": "Virtual Disk    ",
      "serial": null,
      "size": "407379968",
      "state": "running",
      "owner": "root",
      "group": "root",
      "mode": "brw-------",
      "alignment": "0",
      "min-io": "512",
      "opt-io": "0",
      "phy-sec": "512",
      "log-sec": "512",
      "rota": "1",
      "sched": "none",
      "rq-size": "950",
      "type": "disk",
      "disc-aln": "0",
      "disc-gran": "2097152",
      "disc-max": "4294966784",
      "disc-zero": "0",
      "wsame": "0",
      "wwn": null,
      "rand": "1",
      "pkname": null,
      "hctl": "0:0:0:0",
      "tran": null,
      "subsystems": "block:scsi:vmbus:acpi",
      "rev": "1.0 ",
      "vendor": "Msft    ",
      "zoned": "none"
    }
  ]
}