[patch/mi] replace list_begin/end with begin/end

[Andrew Cagney]

Hello,

The attatched patch (... yep) replaces the ui_out_list_{begin,end}() 
interface with a more general ui_out_{begin,end}() interface.  It 
doesn't change any of the implementations (namely MI) and doesn't modify 
any of the output.  That is for a later patch.

	Andrew