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/interface.go

@@ -0,0 +1,26 @@
+package config
+
+import (
+	"github.com/analogj/scrutiny/collector/pkg/models"
+	"github.com/spf13/viper"
+)
+
+// Create mock using:
+// mockgen -source=collector/pkg/config/interface.go -destination=collector/pkg/config/mock/mock_config.go
+type Interface interface {
+	Init() error
+	ReadConfig(configFilePath string) error
+	Set(key string, value interface{})
+	SetDefault(key string, value interface{})
+
+	AllSettings() map[string]interface{}
+	IsSet(key string) bool
+	Get(key string) interface{}
+	GetBool(key string) bool
+	GetInt(key string) int
+	GetString(key string) string
+	GetStringSlice(key string) []string
+	UnmarshalKey(key string, rawVal interface{}, decoderOpts ...viper.DecoderConfigOption) error
+
+	GetScanOverrides() []models.ScanOverride
+}