Fix gh-612 "crash on start".
Fix gh-612 "crash on start".

tarantoolctl instance management script may run atexit()
handler a few times - and if the call stack leads back to lua_call(),
trying to free Lua state from within Lua call produced a crash.

Don't try to close lua_State from within lua_call,
this leads to a sudden death during an otherwise
orderly shutdown.

nvoron23/tarantool,guard163/tarantool,KlonD90/tarantool,condor-the-bird/tarantool,Sannis/tarantool,KlonD90/tarantool,dkorolev/tarantool,KlonD90/tarantool,ocelot-inc/tarantool,KlonD90/tarantool,nvoron23/tarantool,rtsisyk/tarantool,mejedi/tarantool,nvoron23/tarantool,dkorolev/tarantool,guard163/tarantool,nvoron23/tarantool,rtsisyk/tarantool,vasilenkomike/tarantool,dkorolev/tarantool,KlonD90/tarantool,mejedi/tarantool,guard163/tarantool,ocelot-inc/tarantool,nvoron23/tarantool,guard163/tarantool,vasilenkomike/tarantool,mejedi/tarantool,rtsisyk/tarantool,guard163/tarantool,mejedi/tarantool,dkorolev/tarantool,rtsisyk/tarantool,vasilenkomike/tarantool,dkorolev/tarantool,Sannis/tarantool,vasilenkomike/tarantool,ocelot-inc/tarantool,condor-the-bird/tarantool,Sannis/tarantool,Sannis/tarantool,condor-the-bird/tarantool,ocelot-inc/tarantool,condor-the-bird/tarantool,Sannis/tarantool,vasilenkomike/tarantool,nvoron23/tarantool,condor-the-bird/tarantool