Fix of code review errors:
1. Restructure of tc_buf
2. Move out strip_end_ws
3. Rewrite EOF and EOL parsing in tc_buf_readline_pipe()
Add support of -D (--delim) argument, that sets delimiter on start of tarantool client.
Also, if you "cat" .snap or .xlog files in LUA format it prints "setopt delim='<delim>'\n" and delim in end of every coomand.