[#493] cmd/node: Add apiclient section to config

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

cmd/neofs-node/config/apiclient/config.go

@@ -0,0 +1,27 @@
+package apiclientconfig
+
+import (
+	"time"
+
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
+)
+
+const (
+	subsection = "apiclient"
+
+	// DialTimeoutDefault is a default dial timeout of NeoFS API client connection.
+	DialTimeoutDefault = 5 * time.Second
+)
+
+// DialTimeout returns value of "dial_timeout" config parameter
+// from "apiclient" section.
+//
+// Returns DialTimeoutDefault if value is not positive duration.
+func DialTimeout(c *config.Config) time.Duration {
+	v := config.DurationSafe(c.Sub(subsection), "dial_timeout")
+	if v != 0 {
+		return v
+	}
+
+	return DialTimeoutDefault
+}