bug#50344: C-x v keybinding for vc-print-branch-log

[Gregory Heytings]

> It doesn't really make sense to move the branch commands to 'C-x v <' 
> while vc-dir-mode-map has branch commands on 'C-x v B'. We should make 
> the UI more uniform, not create more exceptions.

These were my 2 cents, just an idea.

> It's not mnemonic either.

IMO it is, '<' is a visual representation of two branches.  I wouldn't be 
surprised if '<' was used (as an icon) to open a dialog for branch 
operations in some other editor.