Allow failures for Selenium tests temporarily

Issue: #14138

Signed-off-by: Maurício Meneghini Fauth <mauriciofauth@gmail.com>

.travis.yml

@@ -61,8 +61,6 @@ after_success:
 matrix:
   fast_finish: true
   include:
-    - php: "7.1"
-      env: CI_MODE=selenium
     - php: "7.0"
       env: CI_MODE=release
     - php: "7.1"
@@ -83,6 +81,8 @@ matrix:
         - mysql.server start
 
   allow_failures:
+    - php: "7.1"
+      env: CI_MODE=selenium
     - php: "nightly"
       env: CI_MODE=test