MAGETWO-59702: [FT] Magento\Customer\Test\TestCase\RegisterCustomerFrontendEntityTest fails randomly on CI

- Change loader;

Author: adifucan

dev/tests/functional/tests/app/Magento/Customer/Test/TestCase/RegisterCustomerFrontendEntityTest.xml

@@ -14,6 +14,7 @@
             <data name="customer/data/is_subscribed" xsi:type="string">No</data>
             <data name="customer/data/password" xsi:type="string">123123^q</data>
             <data name="customer/data/password_confirmation" xsi:type="string">123123^q</data>
+            <data name="tag" xsi:type="string">test_type:acceptance_test</data>
             <constraint name="Magento\Customer\Test\Constraint\AssertCustomerSuccessRegisterMessage" />
             <constraint name="Magento\Customer\Test\Constraint\AssertCustomerInGrid" />
             <constraint name="Magento\Customer\Test\Constraint\AssertCustomerLogout" />
@@ -25,6 +26,7 @@
             <data name="customer/data/is_subscribed" xsi:type="string">Yes</data>
             <data name="customer/data/password" xsi:type="string">123123^q</data>
             <data name="customer/data/password_confirmation" xsi:type="string">123123^q</data>
+            <data name="tag" xsi:type="string">test_type:acceptance_test</data>
             <constraint name="Magento\Customer\Test\Constraint\AssertCustomerSuccessRegisterMessage" />
             <constraint name="Magento\Customer\Test\Constraint\AssertCustomerInGrid" />
             <constraint name="Magento\Customer\Test\Constraint\AssertCustomerForm" />

dev/tests/functional/tests/app/Magento/Ui/Test/Block/Adminhtml/DataGrid.php

@@ -165,7 +165,7 @@ public function resetFilter()
      */
     protected function waitFilterToLoad()
     {
-        $this->getTemplateBlock()->waitForElementNotVisible($this->loader);
+        $this->getTemplateBlock()->waitLoader();
         $browser = $this->_rootElement;
         $selector = $this->filterButton . ', ' . $this->resetButton;
         $browser->waitUntil(