Author: Cameron Ball
MDL-21912 restore: Add admin setting to restore conflicting admin user
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6ab7e0d283991bd03f0cc8a8d94e66271e998085
http://github.com/moodle/moodle/commit/6ab7e0d283991bd03f0cc8a8d94e66271e998085
+ 3.0 en [importgeneralduplicateadminallowed,core_backup]
+ 3.0 en [importgeneralduplicateadminallowed_desc,core_backup]
+ 3.0 en [restoremnethostidmismatch,core]