MDL-43738 behat: Refactoring the field type guesser

The previous behaviour delegates the responsability
of overwriting the 3 public methods to the child
classes, now the field type or moodleform field is
guessed earlier in the execution flow.

Other changes introduced here:
- Fix wrong moodleform detection when there is a form
  in the page but the field we are dealing with is
  not inside it.
- Updating the last week feature files to these new
  step definitions.
- Some coding style changes.

mod/quiz/tests/behat/add_quiz.feature

@@ -36,7 +36,7 @@ Feature: Add a quiz
     And I press "Attempt quiz now"
     Then I should see "Question 1"
     And I should see "Answer the first question"
-    And I select "True" radio button
+    And I set the field "True" to "1"
     And I press "Next"
     And I should see "Answer saved"
     And I press "Submit all and finish"

mod/quiz/tests/behat/behat_mod_quiz.php

@@ -60,9 +60,9 @@ class behat_mod_quiz extends behat_base {
             new Given("I follow \"$quizname\""),
             new Given("I follow \"$editquiz\""),
             new Given("I press \"$addaquestion\""),
-            new Given("I select \"$questiontype\" radio button"),
+            new Given("I set the field \"$questiontype\" to \"1\""),
             new Given("I press \"$next\""),
-            new Given("I fill the moodle form with:", $table),
+            new Given("I set the following fields to these values:", $table),
             new Given("I press \"$savechanges\"")
         );
     }