Change 'Open to Google' setting to 'Open to search engines'

Setup (Do this section for Tests 1 and 2)

1. If your moodle instance is currently installed, uninstall it.
2. Checkout the 3.7.0 tag:

   git checkout v3.7.0

3. Install your site.

Test 1 (no existing value set, or set to unchecked)

1. Navigate to Site administration > Security > Site security settings.
2. Make sure that the "Open to Google" (opentogoogle) checkbox is unchecked.
3. Checkout the master branch

   git checkout master

4. Go to the site admin page.
5. CONFIRM You are prompted to upgrade.
6. Complete the upgrade, CONFIRMING you do receive a page prompting you to set a new config value "Open to search engines".
7. Navigate to Site administration > Security > Site security settings.
8. CONFIRM you now see "Open to search engines" (opentowebcrawlers) instead of the previous opentogoogle setting.
9. CONFIRM that setting is still not ticked.

Test 2 (existing value set)

1. Navigate to Site administration > Security > Site security settings.
2. Tick the "Open to Google" (opentogoogle) checkbox and click save changes.
3. Checkout the master branch

   git checkout master

4. Go to the site admin page.
5. CONFIRM You are prompted to upgrade.
6. Complete the upgrade, CONFIRMING you do not receive a page prompting you to set a new config value "Open to search engines".
7. Navigate to Site administration > Security > Site security settings.
8. CONFIRM you now see "Open to search engines" (opentowebcrawlers) instead of the previous opentogoogle setting.
9. CONFIRM that setting is ticked.

Test 3 (Security overview report)

1. Navigate to Site administration > Reports > Security overview.
2. Open another browser tab (tab 2) and navigate to Site administration and search for opentowebcrawlers. (So you can easily change this and save for the next test steps)
3. Open another browser tab (tab 3) and navigate to Site administration and search for guestloginbutton. (So you can easily change this and save for the next test steps)
4. Go to tab 2 and tab 3 and set the following combinations of opentowebcrawlers and guestloginbutton settings and refresh the Security overview tab for each combination:

   Case	opentowebcrawlers	guestloginbutton
   1	Yes	Show
   2	No	Show
   3	Yes	Hide
   4	No	Hide

5. Check the "Open to search engines" row on the Security overview page.
6. CONFIRM that there is no reference to Google on the page in all of the above cases.
7. CONFIRM that you see the following information for following cases

   Case	Status	Description
   1	Information	Search engines may enter as guests.
   2	OK	Search engine access is not enabled.
   3	Serious	Search engine access is allowed but guest access is disabled.
   4	OK	Search engine access is not enabled.

8. In each of the above case, click the "Open to search engines" link.
9. CONFIRM the overview page that loads only refers to "search engines" and there is no reference to Google.