MDL-65630 mod_quiz: Move logging in to the start of tests

The background is for set up, the scenario is for the test. Logging in
to start the test is the start of the test and the end of the background
itself.

mod/quiz/tests/behat/attempt_redo_questions.feature

@@ -30,11 +30,11 @@ Feature: Allow students to redo questions in a practice quiz, without starting a
       | question | page | maxmark |
       | TF1      | 1    | 2       |
       | TF2      | 1    | 1       |
-    And I log in as "student"
-    And I am on "Course 1" course homepage
 
   @javascript
   Scenario: After completing a question, there is a redo question button that restarts the question
+    Given I log in as "student"
+    And I am on "Course 1" course homepage
     When I follow "Quiz 1"
     And I press "Attempt quiz now"
     And I click on "False" "radio" in the "First question" "question"
@@ -45,6 +45,8 @@ Feature: Allow students to redo questions in a practice quiz, without starting a
 
   @javascript
   Scenario: The redo question button is visible but disabled for teachers
+    Given I log in as "student"
+    And I am on "Course 1" course homepage
     When I follow "Quiz 1"
     And I press "Attempt quiz now"
     And I click on "False" "radio" in the "First question" "question"
@@ -59,6 +61,8 @@ Feature: Allow students to redo questions in a practice quiz, without starting a
 
   @javascript
   Scenario: The redo question buttons are no longer visible after the attempt is submitted.
+    Given I log in as "student"
+    And I am on "Course 1" course homepage
     When I follow "Quiz 1"
     And I press "Attempt quiz now"
     And I click on "False" "radio" in the "First question" "question"
@@ -70,6 +74,8 @@ Feature: Allow students to redo questions in a practice quiz, without starting a
 
   @javascript @_switch_window
   Scenario: Teachers reviewing can see all the qestions attempted in a slot
+    Given I log in as "student"
+    And I am on "Course 1" course homepage
     When I follow "Quiz 1"
     And I press "Attempt quiz now"
     And I click on "False" "radio" in the "First question" "question"
@@ -100,6 +106,8 @@ Feature: Allow students to redo questions in a practice quiz, without starting a
 
   @javascript
   Scenario: Redoing question 1 should save any changes to question 2 on the same page
+    Given I log in as "student"
+    And I am on "Course 1" course homepage
     When I follow "Quiz 1"
     And I press "Attempt quiz now"
     And I click on "False" "radio" in the "First question" "question"