main/minetest: added initd and conf file

(cherry picked from commit 52c3cd0153a87c05d8d6f9631ddeabe1188d3fae)
main/minetest: mv pkgdir to subpkgdir in server function

(cherry picked from commit 29570a5451abb43c0b7205f0a26e05032b6c6e6f)
main/minetest: upgrade to 0.4.11

(cherry picked from commit e36d9c05404d489f0ae12e62568553216a925f5f)
main/minetest: various fixes

- fix segfault due to JIT and PaX. Use shared lua instead of luajit
- clean up init.d script. rename to minitest-server
- use shared irrlicht
- move pre-install script to -server subpackage
- start with gameid 'minimal' by default for testing

fixes #3644

(cherry picked from commit 1e340f85df7db29ca1db6bf1350bf046c5023fbb)