general: add unit tests for >80% coverage

Includes a few minor fixes:
- frontend: support setting port for WHOIS server
- proxy: fix handling of very long lines
- proxy: refactor IP allowlist logic, parse allow IP list at startup

frontend/template_test.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/magiconair/properties/assert"
+)
+
+func TestSummaryRowDataNameHasPrefix(t *testing.T) {
+	data := SummaryRowData{
+		Name: "mock",
+	}
+
+	assert.Equal(t, data.NameHasPrefix("m"), true)
+	assert.Equal(t, data.NameHasPrefix("n"), false)
+}
+
+func TestSummaryRowDataNameContains(t *testing.T) {
+	data := SummaryRowData{
+		Name: "mock",
+	}
+
+	assert.Equal(t, data.NameContains("oc"), true)
+	assert.Equal(t, data.NameContains("no"), false)
+}