Remove course-sharing functionality

Confirm all behat/unit tests execute fine. 

Prerequisites

1. A course with some content in it.
2. DB access required.

Before patch is applied

1. Install a moodle site
2. Enable course sharing(enablecoursepublishing in Site Administration) - For master and 37

After patch

For master and 37

1. As an admin, go to the course created.
2. Open the 'Course Administration' menu
3. Confirm you do not see a 'Share' link in the menu.
4. Go to 'Site Administration' -> 'Advanced features'
5. Confirm you cannot see the checkbox 'Course sharing on Moodle.net'(enablecoursepublishing)
6. Confirm you do not see the config 'enablecoursepublishing' in the config table

   SELECT *

   FROM mdl_config

   WHERE name = 'enablecoursepublishing'

7. Confirm you do not see the moodle/course:publish, moodle/backup:backuptargethub and moodle/restore:restoretargethub capabilities in the capabilities table

   SELECT *

   FROM mdl_capabilities

   WHERE name IN ('moodle/course:publish', 'moodle/backup:backuptargethub',

   'moodle/restore:restoretargethub')

8. Try to assign capabilities to roles by going to Site administration > Users > Permissions > Define roles, clicking the edit icon opposite the teacher role and searching for the previously mentioned capabilities. Confirm the previously mentioned capabilities cannot be found.
9. Confirm you can still register your site (go to Site Administration -> Registration)

For 36

1. As an admin, go to the course created.
2. Open the 'Course Administration' menu
3. Confirm you do not see a 'Share' link in the menu.
4. Go to 'Site Administration' -> 'Advanced features'
5. Confirm you do not see the moodle/course:publish, moodle/backup:backuptargethub and moodle/restore:restoretargethub capabilities in the capabilities table

   SELECT *

   FROM mdl_capabilities

   WHERE name IN ('moodle/course:publish', 'moodle/backup:backuptargethub',

   'moodle/restore:restoretargethub')

6. Try to assign capabilities to roles by going to Site administration > Users > Permissions > Define roles, clicking the edit icon opposite the teacher role and searching for the previously mentioned capabilities. Confirm the previously mentioned capabilities cannot be found.
7. Confirm you can still register your site (go to Site Administration -> Registration)

Automated testing

1. Confirm all automated tests pass.