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/LoggingAuditTrailTests.java
"delete":{"privileges":{"application":""");
        if (deletePrivilegesRequest.application() != null) {
            deletePrivilegesAuditEventStringBuilder.append("\"").append(deletePrivilegesRequest.application()).append("\"");
        } else {
            deletePrivilegesAuditEventStringBuilder.append("null");
        }
        deletePrivilegesAuditEventStringBuilder.append(",\"privileges\":");
        if (deletePrivilegesRequest.privileges() == null) {
            deletePrivilegesAuditEventStringBuilder.append("null");
        } else if (deletePrivilegesRequest.privileges().length == 0) {
            deletePrivilegesAuditEventStringBuilder.append("[]");
        } else {
            deletePrivilegesAuditEventStringBuilder.append("[");
            for (String privilege : deletePrivilegesRequest.privileges()) {
                if (privilege == null) {
                    deletePrivilegesAuditEventStringBuilder.append("null,");
                } else {
                    deletePrivilegesAuditEventStringBuilder.append("\"").append(privilege).append("\",");
                }
            }
            
            deletePrivilegesAuditEventStringBuilder.deleteCharAt(deletePrivilegesAuditEventStringBuilder.length() - 1);
            deletePrivilegesAuditEventStringBuilder.append("]");
        }
        deletePrivilegesAuditEventStringBuilder.append("}}");
        String expectedDeletePrivilegesEventString = deletePrivilegesAuditEventStringBuilder.toString();
        assertThat(generatedDeletePrivilegesAuditEventString, containsString(expectedDeletePrivilegesEventString));
        generatedDeletePrivilegesAuditEventString = generatedDeletePrivilegesAuditEventString.replace(
            ", " + expectedDeletePrivilegesEventString,
            ""