MQE-570: Sanitize MAGENTO_BASE_URL (.env file) and Selenium params

- Made SELENIUM_VARS optional in .example, as they now can be.

Author: KevinBKozan

dev/tests/acceptance/.env.example

@@ -35,11 +35,11 @@ MAGENTO_BACKEND_NAME=
 MAGENTO_ADMIN_USERNAME=
 MAGENTO_ADMIN_PASSWORD=
 
-#*** Selenium Server Protocol, Host, Port, and Path, with local defaults. Change if not running Selenium locally.
-SELENIUM_HOST=127.0.0.1
-SELENIUM_PORT=4444
-SELENIUM_PROTOCOL=http
-SELENIUM_PATH=/wd/hub
+#*** Selenium Server Protocol, Host, Port, and Path, with local defaults. Uncomment and change if not running Selenium locally.
+#SELENIUM_HOST=127.0.0.1
+#SELENIUM_PORT=4444
+#SELENIUM_PROTOCOL=http
+#SELENIUM_PATH=/wd/hub
 
 #*** Uncomment and set host & port if your dev environment needs different value other than MAGENTO_BASE_URL for Rest API Requests ***#
 #MAGENTO_RESTAPI_SERVER_HOST=