adding support for a collecto config file.

/scrutiny/config/collector.yaml

Adding ability to specify host identifier (label), that is updated on every collector run.
Can be specified by `host-id` CLI or `COLLECTOR_HOST_ID` env var.

Created a config class, interface and associated tests.

Created a "TransformDetectedDrives" function, that will allow users to insert drives not detected by Smarctl --scan, ignore drives that they dont want, and override smartctl device type.

Added Upsert functionality when registering devices.

Replaced "github.com/jinzhu/gorm" with "gorm.io/gorm" (ORM location moved, was using incorrect lib url)
Removed machineid library.

collector/pkg/config/testdata/simple_device.yaml

@@ -0,0 +1,27 @@
+version: 1
+devices:
+  - device: /dev/sda
+    type: 'sat'
+#
+#  # example to show how to ignore a specific disk/device.
+#  - device: /dev/sda
+#    ignore: true
+#
+#  # examples showing how to force smartctl to detect disks inside a raid array/virtual disk
+#  - device: /dev/bus/0
+#    type:
+#      - megaraid,14
+#      - megaraid,15
+#      - megaraid,18
+#      - megaraid,19
+#      - megaraid,20
+#      - megaraid,21
+#
+#  - device: /dev/twa0
+#    type:
+#      - 3ware,0
+#      - 3ware,1
+#      - 3ware,2
+#      - 3ware,3
+#      - 3ware,4
+#      - 3ware,5