Setting hostname for motd

Add a setting to disable this functionality (in the next PR): https://git.ckcorp.ru/ck/game-dev/regamedll_cse/blob/e924a266b047d4bc866cf1e66ec9030b33fc85f7/regamedll/dlls/multiplay_gamerules.cpp#L4815

Edited Apr 08, 2019 by Artem Golubikhin