gh-1133: Multiline Lua in console w/o delimiter

All decent Lua shells support multiline input without explicit
delimiters. A shell consumes line after line; once a complete statement
is read it is executed.

Works with both local and remote consoles, including the older ones
without this modification.

Caveat: when talking with a remote console internally '$EOF$\n' is used
to separate statements. It is possible to produce an input with embeded
delimiter thanks to this modification.

Note: funny input was already possible with non-standard local
delimiter.