Add checks if the file or dir names are sane.

lib/inets/src/ftp/ftp.erl: Check the filenames, usernames, passwords etc...
    for <CR> and <LF> in them and return error if these offending chars
    are found. See http://erlang.org/pipermail/erlang-bugs/2014-January/003998.html
    for details.
lib/inets/test/ftp_suite_lib.erl: Added checks for <CR><LF> in file and directory
    names.