Allows luarocks.cfg to be used without being installed.
Allows luarocks.cfg to be used without being installed.

This allows to address the issue #386

tarantool/luarocks,luarocks/luarocks,robooo/luarocks,xpol/luavm,starius/luarocks,ignacio/luarocks,xpol/luainstaller,aryajur/luarocks,lxbgit/luarocks,keplerproject/luarocks,xpol/luainstaller,robooo/luarocks,coderstudy/luarocks,usstwxy/luarocks,xpol/luainstaller,luarocks/luarocks,tst2005/luarocks,robooo/luarocks,aryajur/luarocks,lxbgit/luarocks,ignacio/luarocks,keplerproject/luarocks,xiaq/luarocks,rrthomas/luarocks,usstwxy/luarocks,rrthomas/luarocks,luarocks/luarocks,aryajur/luarocks,tst2005/luarocks,ignacio/luarocks,usstwxy/luarocks,tarantool/luarocks,xiaq/luarocks,starius/luarocks,coderstudy/luarocks,xiaq/luarocks,xpol/luavm,xiaq/luarocks,tst2005/luarocks,xpol/luarocks,tst2005/luarocks,starius/luarocks,keplerproject/luarocks,usstwxy/luarocks,aryajur/luarocks,lxbgit/luarocks,xpol/luavm,xpol/luarocks,starius/luarocks,xpol/luainstaller,xpol/luarocks,tarantool/luarocks,coderstudy/luarocks,xpol/luarocks,robooo/luarocks,keplerproject/luarocks,ignacio/luarocks,rrthomas/luarocks,coderstudy/luarocks,rrthomas/luarocks,lxbgit/luarocks,xpol/luavm,xpol/luavm