Merge branch '3.1'

* 3.1:
  fixed CS
  Properly format value in UniqueEntityValidator
  [Translation][fallback] add missing resources in parent catalogues.
  removed a deprecation notice
  [Form] Fix show float values as choices values in ChoiceType
  Remove double use Statement
  Improved the design of the metrics in the profiler
  [Yaml] set arguments depending on the PHP version
  [Console] Fix infinite loop on missing input
  [HttpFoundation][Session] memcached connection should not be closed

Author: fabpot

Tests/InlineTest.php

@@ -566,7 +566,12 @@ public function testParseTimestampAsDateTimeObject($yaml, $year, $month, $day, $
         $expected = new \DateTime($yaml);
         $expected->setTimeZone(new \DateTimeZone('UTC'));
         $expected->setDate($year, $month, $day);
-        @$expected->setTime($hour, $minute, $second, 1000000 * ($second - (int) $second));
+
+        if (PHP_VERSION_ID >= 70100) {
+            $expected->setTime($hour, $minute, $second, 1000000 * ($second - (int) $second));
+        } else {
+            $expected->setTime($hour, $minute, $second);
+        }
 
         $this->assertEquals($expected, Inline::parse($yaml, Yaml::PARSE_DATETIME));
     }