Cleaned up config handling

- moved everything to cmd/root.go
- Sanitize all paths to full absolute ones
- Set a config key with the current config basedir
- moved default config logging to a central location
- resolve user config dir relative to config dir
- change cwd to config dir

service/config.go

@@ -3,6 +3,7 @@ package service
 import (
 	"encoding/json"
 	"log"
+	"path/filepath"
 
 	"github.com/spf13/viper"
 )
@@ -40,7 +41,12 @@ func LoadConfig() {
 	// viper.UnmarshalKey("Service", &C)
 	C.DNS.Server = viper.GetString("Service.DNS.Server")
 	C.DNS.DefaultTTL = viper.GetUint32("Service.DNS.DefaultTTL")
-	C.Users.ConfigDir = viper.GetString("Service.Users.ConfigDir")
+	path := viper.GetString("Service.Users.ConfigDir")
+	if filepath.IsAbs(path) {
+		C.Users.ConfigDir = filepath.Clean(path)
+	} else {
+		C.Users.ConfigDir = filepath.Join(viper.GetString("ConfigDir"), path)
+	}
 }
 
 func (obj *config) PrettyPrint() string {