add api documentation and data for course restriction settings

test plan:
* should be able to view api documentation for the new
 "restrict_student_past_view" and "restrict_student_future_view"
 course settings, as well as retrieve the values
 through the settings API

closes #CNVS-19425

Change-Id: Icca2fdc959f67591400990ac4a5ea532f2adce1d
Reviewed-on: https://gerrit.instructure.com/50690
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
QA-Review: Jahnavi Yetukuri <jyetukuri@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>

app/controllers/courses_controller.rb

@@ -1037,6 +1037,12 @@ class CoursesController < ApplicationController
   # @argument lock_all_announcements [Boolean]
   #   Disable comments on announcements
   #
+  # @argument restrict_student_past_view [Boolean]
+  #   Restrict students from preventing courses after end date
+  #
+  # @argument restrict_student_future_view [Boolean]
+  #   Restrict students from viewing courses before start date
+  #
   # @example_request
   #   curl https://<canvas>/api/v1/courses/<course_id>/settings \
   #     -X PUT \

lib/api/v1/course.rb

@@ -33,6 +33,8 @@ module Api::V1::Course
     settings[:hide_final_grades] = course.hide_final_grades?
     settings[:hide_distribution_graphs] = course.hide_distribution_graphs?
     settings[:lock_all_announcements] = course.lock_all_announcements?
+    settings[:restrict_student_past_view] = course.restrict_student_past_view?
+    settings[:restrict_student_future_view] = course.restrict_student_future_view?
 
     settings
   end

spec/apis/v1/courses_api_spec.rb

@@ -2286,7 +2286,9 @@ describe CoursesController, type: :request do
         'allow_student_organized_groups' => true,
         'hide_distribution_graphs' => false,
         'hide_final_grades' => false,
-        'lock_all_announcements' => false
+        'lock_all_announcements' => false,
+        'restrict_student_past_view' => false,
+        'restrict_student_future_view' => false
       })
     end
 
@@ -2305,7 +2307,9 @@ describe CoursesController, type: :request do
         :allow_student_organized_groups => false,
         :hide_distribution_graphs => true,
         :hide_final_grades => true,
-        :lock_all_announcements => true
+        :lock_all_announcements => true,
+        :restrict_student_past_view => true,
+        :restrict_student_future_view => true
       })
       expect(json).to eq({
         'allow_student_discussion_topics' => false,
@@ -2316,7 +2320,9 @@ describe CoursesController, type: :request do
         'allow_student_organized_groups' => false,
         'hide_distribution_graphs' => true,
         'hide_final_grades' => true,
-        'lock_all_announcements' => true
+        'lock_all_announcements' => true,
+        'restrict_student_past_view' => true,
+        'restrict_student_future_view' => true
       })
       @course.reload
       expect(@course.allow_student_discussion_topics).to eq false