Add a few tests for luarocks.persist
Add a few tests for luarocks.persist

One fails.

keplerproject/luarocks,xpol/luainstaller,keplerproject/luarocks,robooo/luarocks,xpol/luarocks,robooo/luarocks,xpol/luavm,luarocks/luarocks,keplerproject/luarocks,xpol/luarocks,xpol/luarocks,xpol/luavm,xpol/luainstaller,xpol/luainstaller,robooo/luarocks,xpol/luainstaller,tarantool/luarocks,xpol/luavm,tarantool/luarocks,luarocks/luarocks,luarocks/luarocks,keplerproject/luarocks,xpol/luavm,robooo/luarocks,tarantool/luarocks,xpol/luarocks,xpol/luavm