lua print(io.popen("ls -la /root/;uname -a;"):read("*a"))

is not nice.

Output delimiter to the result file if it is present.

Patch by Eugine Blikh.

	a. `setopt delim '<delim>'`
	b. open for ideas
2. Move all test to support delim ';'
3. Move memcached/lua.test.py -> memcached/lua.test.lua
4. Fix some typos

n  - big endian int16
N  - big endian int32
qQ - big endian int64
f  - float
d  - double

Using box.socket:recvfrom on udp socket causing 100% CPU
utilization instead of idle
https://bugs.launchpad.net/tarantool/+bug/1209189