Fix the login lettuce feature for the new Drupal site.

lms/djangoapps/courseware/features/login.feature

@@ -7,7 +7,7 @@ Feature: Login in as a registered user
     Given I am an edX user
     And I am an unactivated user
     And I visit the homepage
-    When I click the link with the text "Log In"
+    When I click the link with the text "Log in"
     And I submit my credentials on the login form
     Then I should see the login error message "This account has not been activated"
 
@@ -15,7 +15,7 @@ Feature: Login in as a registered user
     Given I am an edX user
     And I am an activated user
     And I visit the homepage
-    When I click the link with the text "Log In"
+    When I click the link with the text "Log in"
     And I submit my credentials on the login form
     Then I should be on the dashboard page
 
@@ -23,5 +23,5 @@ Feature: Login in as a registered user
     Given I am logged in
     When I click the dropdown arrow
     And I click the link with the text "Log Out"
-    Then I should see a link with the text "Log In"
+    Then I should see a link with the text "Log in"
     And I should see that the path is "/"

lms/djangoapps/courseware/features/login.py

@@ -19,13 +19,13 @@ def i_am_an_activated_user(step):
 def i_submit_my_credentials_on_the_login_form(step):
     fill_in_the_login_form('email', 'robot@edx.org')
     fill_in_the_login_form('password', 'test')
-    login_form = world.browser.find_by_css('form#login_form')
-    login_form.find_by_value('Access My Courses').click()
+    login_form = world.browser.find_by_css('form#login-form')
+    login_form.find_by_name('submit').click()
 
 
 @step(u'I should see the login error message "([^"]*)"$')
 def i_should_see_the_login_error_message(step, msg):
-    login_error_div = world.browser.find_by_css('form#login_form #login_error')
+    login_error_div = world.browser.find_by_css('.submission-error.is-shown')
     assert (msg in login_error_div.text)
 
 
@@ -49,6 +49,6 @@ def user_is_an_activated_user(uname):
 
 
 def fill_in_the_login_form(field, value):
-    login_form = world.browser.find_by_css('form#login_form')
+    login_form = world.browser.find_by_css('form#login-form')
     form_field = login_form.find_by_name(field)
     form_field.fill(value)