Make -eofchar and -translation options read only for

	server sockets. [Bug 496733]

	* generic/tclIO.c (Tcl_GetChannelOption, Tcl_SetChannelOption):
	Instead of returning nothing for the -translation option
	on a server socket, always return "auto". Return the empty
	string enclosed in quotes for the -eofchar option on
	a server socket. Fixup -eofchar usage message so that
	it matches the implementation.
	* tests/io.test: Add -eofchar tests and -translation tests
	to ensure options are read only on server sockets.
	* tests/socket.test: Update tests to account for -eofchar
	and -translation option changes.

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