XML RPC request should get hard blocker quicker

[enejb]

Currently math fallback doesn't do anything for xml rpc requests. Lets hard block xmlprc requests when they get marked as blocked. This would help prevent more of the requests coming though.

This PR blocks xmlrpc requests for would regularly show the math test just gets bypassed and allows more valid xml rpc requests though.

Testing instructions:

use the following code. composer.json

{
    "name": "xmlrpc-tester",
    "type": "test",
    "require": {
        "hieu-le/wordpress-xmlrpc-client": "~2.0"
    },
    "license": "GPL2",
    "authors": [
        {
            "name": "Enej",
            "email": ""
        }
    ]
}

index.php

require __DIR__ . '/vendor/autoload.php';
# Your Wordpress website is at: http://wp-website.com
$endpoint = "https://enej.wpsandbox.me/aaa/xmlrpc.php";

# Create client instance
$wpClient = new \HieuLe\WordpressXmlrpcClient\WordpressClient();
# Log error
$wpClient->onError(function($error, $event) {
	print_r( $error );
});

# Set the credentials for the next requests
$do = $wpClient->setCredentials( $endpoint, 'enejtest999', 'nopassword' );

print_r( $wpClient->getPost( 11395 ) );

run composer install to install the dependencies
run php index.php

You should get blocked pretty after a few attempts.
with an error.

Changelog entry

Started blocking XML RPC requests when they get marked as blocked by Protect.

[lezama]

cc @dereksmart

[samhotchkiss]

Didn't test, but code is simple and looks 💯

Definitely comfortable shipping this. We should make sure to give HEs a heads up to let us know if we can an influx in tickets where users are having their XML-RPC connections blocked. I wouldn't expect this, but better safe than sorry...

cc: @richardmtl @chaselivingston

[enejb]

cc @dereksmart

[dereksmart]

👍