Author: Huong Nguyen
MDL-75316 admin: Create Share to MoodleNet experimental setting
Originally implemented as MDL-75319
http://git.moodle.org/gw?p=moodle.git;a=commit;h=d9a65774104c8dbd618cfdd0fb6c23e9c2f1edb8
http://github.com/moodle/moodle/commit/d9a65774104c8dbd618cfdd0fb6c23e9c2f1edb8
+ 4.2 en [enablesharingtomoodlenet,core_admin]