Fix test cases

Author: MarcialRosales

selenium/test/mgt-only/rabbitmq.conf

@@ -2,6 +2,6 @@ auth_backends.1 = rabbit_auth_backend_internal
 
 management.login_session_timeout = 150
 management_agent.disable_metrics_collector = true
-load_definitions = ${RABBITMQ_TEST_DIR}/imports/users.json
+load_definitions = ${IMPORT_DIR}/users.json
 
 loopback_users = none

selenium/test/multi-oauth/rabbitmq.enable-basic-auth.conf

@@ -2,4 +2,4 @@
 auth_backends.2 = rabbit_auth_backend_internal
 
 management.oauth_disable_basic_auth = false
-load_definitions = ${RABBITMQ_TEST_DIR}/imports/users.json
+load_definitions = ${IMPORT_DIR}/users.json

selenium/test/oauth/rabbitmq.load-user-definitions.conf

@@ -1,2 +1,2 @@
 
-load_definitions = ${RABBITMQ_TEST_DIR}/imports/users.json
+load_definitions = ${IMPORT_DIR}/users.json

selenium/test/pageobjects/BasePage.js

@@ -349,7 +349,7 @@ module.exports = class BasePage {
   async chooseFile (locator, file) {
     const element = await this.waitForDisplayed(locator)
     const remote = require('selenium-webdriver/remote');
-    driver.setFileDetector(new remote.FileDetector);
+    this.driver.setFileDetector(new remote.FileDetector);
     return element.sendKeys(file)
   }
   async acceptAlert () {