Author: Jake Dallimore
MDL-63037 mnet: fix hostexists string usage
http://git.moodle.org/gw?p=moodle.git;a=commit;h=d34d35d2b6d1df82be7facea3d1ba959180a3d69
http://github.com/moodle/moodle/commit/d34d35d2b6d1df82be7facea3d1ba959180a3d69
+ 3.11 en [hostexists,core_mnet]