Implement core_privacy for auth_mnet plugin

Automatic testing can be achieved by executing the attached scripts (see Privacy API/Utilities doc]). Make sure you've purged the caches (php admin/cli/purge_caches.php), before running the scripts.

• Check that auth_mnet plugin is compliant: testwithmanager.php
  Assign user to be tested inside the script (for instance, 84):

  $user = \core_user::get_user(84);

  Run script:

  php testscriptwithmanager.php auth

  Running testscriptwithmanager.php, if mnet_log table is empty or not have records associated to the user, you should receive a script output like:

  Testing the compliant plugins:

  ...

  == auth_mnet (auth_mnet\privacy\provider) ==

  Found 4 items of metadata

  Nothing to export.

  ...

  After inserting some records in table mnet_log with the userid to be tested, you should get:

  Testing the compliant plugins:

  ...

  == auth_mnet (auth_mnet\privacy\provider) ==

  Found 4 items of metadata

  Successfully ran a test export

  ...

  Example records for testing (change table name and userid value). Note that mnet_log.hostid must match mnet_host.id.

  INSERT INTO mnet_host (id, deleted, wwwroot, ip_address, name, public_key, public_key_expires, transport, portno, last_connect_time, last_log_id, force_theme, theme, applicationid, sslverification) VALUES (3, 0, 'https://34.moodle.test', '127.0.0.1', 'Moodle Test A', '-----BEGIN CERTIFICATE----', 1527854427, 0, 0, 1525439658, 0, 0, NULL, 1, 0);

  INSERT INTO mnet_host (id, deleted, wwwroot, ip_address, name, public_key, public_key_expires, transport, portno, last_connect_time, last_log_id, force_theme, theme, applicationid, sslverification) VALUES (5, 0, 'https://33.moodle.test', '127.0.0.1', 'Moodle Test B', '-----BEGIN CERTIFICATE-----', 0, 0, 0, 0, 0, 0, NULL, 1, 0);

  INSERT INTO mnet_log (hostid, remoteid, "time", userid, ip, course, coursename, module, cmid, action, url, info) VALUES (3, 8, 0, 84, '', 2, 'course test 2', 'forum', 23, 'view', '', '');

  INSERT INTO mnet_log (hostid, remoteid, "time", userid, ip, course, coursename, module, cmid, action, url, info) VALUES (5, 4, 0, 84, '', 3, 'course test 3', 'assign', 5, 'view', '', '');

  INSERT INTO mnet_log (hostid, remoteid, "time", userid, ip, course, coursename, module, cmid, action, url, info) VALUES (5, 4, 0, 84, '', 3, 'course test 3', '', 0, '', '', '');

  INSERT INTO mnet_log (hostid, remoteid, "time", userid, ip, course, coursename, module, cmid, action, url, info) VALUES (5, 4, 0, 84, '10.99.101.99', 3, 'course test 3', '', 0, '', '', '');

  INSERT INTO mnet_log (hostid, remoteid, "time", userid, ip, course, coursename, module, cmid, action, url, info) VALUES (5, 4, 0, 84, '', 4, 'course test 4', '', 0, '', '', '');

  INSERT INTO mnet_log (hostid, remoteid, "time", userid, ip, course, coursename, module, cmid, action, url, info) VALUES (5, 4, 0, 84, '', 5, 'course test 5', '', 0, '', '', '');

• Check data exported: testexport.php
  Run the script using the userid being tested:

  php testexport.php --userid=84

  You should get a similar output:

  Processing export for Adéla Němcová

  == File was successfully exported to /path/to/moodledata/masterdata/localcache/70dd06d4-5d6e-47ad-a0d3-bb22d7d386f2/df10ffbb-0e63-452e-9d61-00b86b8a23f3/export.zip

  == File export was uncompressed to /path/to/moodledata/masterdata/temp/privacy/7134f7d9-806e-4a02-9f7d-d02ad5060dcc

  ============================================================================

  Check that the content of the file

  /path/to/moodledata/masterdata/temp/privacy/7134f7d9-806e-4a02-9f7d-d02ad5060dcc/System/User\ Adéla\ Němcová/MNet\ authentication/hostname/coursename/data.json

  matches with the records in table mnet_log for the user being tested.