inlet/geoip: rename country-database to geo-database

This is a first step to accept another kind of GeoIP database (like
City). This also introduces the way we want to deprecate stuff:
transform the map structure.

common/helpers/mapstructure_test.go

@@ -0,0 +1,29 @@
+// SPDX-FileCopyrightText: 2022 Free Mobile
+// SPDX-License-Identifier: AGPL-3.0-only
+
+package helpers
+
+import "testing"
+
+func TestMapStructureMatchName(t *testing.T) {
+	cases := []struct {
+		mapKey    string
+		fieldName string
+		expected  bool
+	}{
+		{"one", "one", true},
+		{"one", "One", true},
+		{"one-two", "OneTwo", true},
+		{"onetwo", "OneTwo", true},
+		{"One-Two", "OneTwo", true},
+		{"two", "one", false},
+	}
+	for _, tc := range cases {
+		got := MapStructureMatchName(tc.mapKey, tc.fieldName)
+		if got && !tc.expected {
+			t.Errorf("%q == %q but expected !=", tc.mapKey, tc.fieldName)
+		} else if !got && tc.expected {
+			t.Errorf("%q != %q but expected ==", tc.mapKey, tc.fieldName)
+		}
+	}
+}