Merge branch '2.7' into 2.8

* 2.7:
  [Security] fix Composer constraint
  Provide less state in getRequestFormat
  fix test class location
  Static code analysis with Php Inspections (EA Extended): dead code dropped, couple bugs fixed

Author: nicolas-grekas

DateFormatter/DateFormat/TimeZoneTransformer.php

@@ -96,6 +96,6 @@ public static function getEtcTimeZoneId($formattedTimeZone)
             return 'Etc/GMT'.($hours !== 0 ? $signal.$hours : '');
         }
 
-        throw new \InvalidArgumentException('The GMT time zone \'%s\' does not match with the supported formats GMT[+-]HH:MM or GMT[+-]HHMM.');
+        throw new \InvalidArgumentException(sprintf("The GMT time zone '%s' does not match with the supported formats GMT[+-]HH:MM or GMT[+-]HHMM.", $formattedTimeZone));
     }
 }