[#552] cmd/node: Implement error checker with details

Implement function `fatalOnErrDetails` similar to `fatalOnErr` but accepting
string details that are written to log output. Use the function everywhere
in application code without wrapping in an if-else statement.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

cmd/neofs-node/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"flag"
+	"fmt"
 	"log"
 
 	"github.com/nspcc-dev/neofs-node/misc"
@@ -11,12 +12,20 @@ import (
 	"go.uber.org/zap"
 )
 
+// prints err to standard logger and calls os.Exit(1).
 func fatalOnErr(err error) {
 	if err != nil {
 		log.Fatal(err)
 	}
 }
 
+// prints err with details to standard logger and calls os.Exit(1).
+func fatalOnErrDetails(details string, err error) {
+	if err != nil {
+		log.Fatal(fmt.Errorf("%s: %w", details, err))
+	}
+}
+
 func main() {
 	configFile := flag.String("config", "", "path to config")
 	flag.Parse()