registerInternalServices(opts) {
		opts = utils.isObject(opts) ? opts : {};
		const internalsSchema = require("./internals")(this);
		let definitiveSchema = {};
		// If it's present any custom definition, define it as the root schema and the default one as a mixin
		if (opts["$node"]) {
			definitiveSchema = opts["$node"];
			if (!definitiveSchema.mixins) definitiveSchema.mixins = [];
			definitiveSchema.mixins.push(internalsSchema);
		} else {
			// Otherwise, just use the default one
			definitiveSchema = internalsSchema;
		}
		this.createService(definitiveSchema);
	}
Register internal services
@param {Object?} opts

@memberof ServiceBroker