fix(firewall): delete chain rules by line number (#2411)

- Fix #2334
- Parsing of iptables chains, contributing to progress for #1856

internal/firewall/interfaces.go

@@ -0,0 +1,13 @@
+package firewall
+
+import "github.com/qdm12/golibs/command"
+
+type Runner interface {
+	Run(cmd command.ExecCmd) (output string, err error)
+}
+
+type Logger interface {
+	Debug(s string)
+	Info(s string)
+	Error(s string)
+}