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/main/java/org/elasticsearch/xpack/security/audit/logfile/LoggingAuditTrail.java
final Map<String, String> commonFields = new HashMap<>();
            if (EMIT_NODE_NAME_SETTING.get(settings)) {
                final String nodeName = Node.NODE_NAME_SETTING.get(settings);
                if (Strings.hasLength(nodeName)) {
                    commonFields.put(NODE_NAME_FIELD_NAME, nodeName);
                }
            }
            if (newLocalNode != null && newLocalNode.getAddress() != null) {
                if (EMIT_HOST_ADDRESS_SETTING.get(settings)) {
                    commonFields.put(HOST_ADDRESS_FIELD_NAME, newLocalNode.getAddress().getAddress());
                }
                if (EMIT_HOST_NAME_SETTING.get(settings)) {
                    commonFields.put(HOST_NAME_FIELD_NAME, newLocalNode.getAddress().address().getHostString());
                }
                if (EMIT_NODE_ID_SETTING.get(settings)) {
                    commonFields.put(NODE_ID_FIELD_NAME, newLocalNode.getId());
                }
                
                commonFields.put(ORIGIN_ADDRESS_FIELD_NAME, newLocalNode.getAddress().toString());
            }
            
            commonFields.put(ORIGIN_TYPE_FIELD_NAME, LOCAL_ORIGIN_FIELD_VALUE);
            if (Lifecycle.State.STARTED.equals(clusterService.lifecycleState())) {
                final ClusterState clusterState = this.clusterService.state();
                if (clusterState == null) {
                    LOGGER.trace("Cluster state not available");
                } else {
                    if (EMIT_CLUSTER_NAME_SETTING.get(settings)) {
                        final String clusterName = clusterState.getClusterName().value();
                        if (Strings.hasLength(clusterName)) {