Some types of audit event samples from [our documentation](https://www.elastic.co/guide/en/elasticsearch/reference/7.17/audit-event-types.html) include the port number in "origin.address", like **access_denied**:
```json
{"type":"audit", "timestamp":"2020-12-30T22:30:06,949+0200", "node.id":
"0RMNyghkQYCc_gVd1G6tZQ", "event.type":"transport", "event.action":
"access_denied", "authentication.type":"REALM", "user.name":"user1",
"user.realm":"default_native", "user.roles":["test_role"], "origin.type":
"rest", "origin.address":"[::1]:52434", "request.id":"yKOgWn2CRQCKYgZRz3phJw",
"action":"indices:admin/auto_create", "request.name":"CreateIndexRequest",
"indices":["<index-{now/d+1d}>"]}
```
but other types like **connection_denied** from this issue does not include the port:

```json
{"type":"audit", "timestamp":"2020-12-30T21:47:31,526+0200", "node.id":
"0RMNyghkQYCc_gVd1G6tZQ", "event.type":"ip_filter", "event.action":
"connection_denied", "origin.type":"rest", "origin.address":"10.10.0.20",
"transport.profile":".http", "rule":"deny 10.10.0.0/16"}
```

I think we should be consistent here and always include the port number in the "origin.address" field.
x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/audit/logfile/LoggingAuditTrailFilterTests.java
return AuthenticationTestHelper.builder()
                .user(effectiveUser)
                .realmRef(new RealmRef(effectiveRealmName, "test", "foo"))
                .build(false);
        }
    }
    private ClusterSettings mockClusterSettings() {
        final List<Setting<?>> settingsList = new ArrayList<>();
        LoggingAuditTrail.registerSettings(settingsList);
        settingsList.addAll(ClusterSettings.BUILT_IN_CLUSTER_SETTINGS);
        return new ClusterSettings(settings, new HashSet<>(settingsList));
    }
    private List<String> randomNonEmptyListOfFilteredNames(String... namePrefix) {
        final List<String> filtered = new ArrayList<>(4);
        for (int i = 0; i < randomIntBetween(1, 4); i++) {
            filtered.add(FILTER_MARKER + Strings.arrayToCommaDelimitedString(namePrefix) + randomAlphaOfLengthBetween(1, 4));
        }
        return filtered;
    }
    private List<String> randomNonEmptyListOfFilteredActions() {
        final List<String> filtered = new ArrayList<>(4);
        final String[] actionPatterns = {
            "internal:transport/proxy/indices:*",
            "indices:data/read/*",
            "internal:transport/proxy/indices:data/read/*",
            "indices:data/write/index*",
            "indices:data/write/bulk*",
            "indices:data/write/index",
            "indices:data/write/index[*",
            "indices:data/write/index:op_type/create",