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merge revision(s) 46457,46458: [Backport #9949]

    * lib/net/ftp.rb (gets, readline): read lines without LF properly.
      [ruby-core:63205] [Bug #9949]

    * test/net/ftp/test_buffered_socket.rb: related test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@46735 b2dd03c8-39d4-4d8f-98ff-823fe69b080e