Emacsserver socket file not removed on exit

[Tacvek]

The socket file of emacsserver is not removed when Emacs is exited.
As far as I can tell, the only thing that causes the server to delete the 
file
is (server-start t), which is called by emacsserver's unload hook.

Presumably the server library is supposed to be unloaded as part
of the emacs exiting process, however emacs does not seem to be doing that.

This bug is found in CVS HEAD of GNU Emacs, and breaks
scripts such as 'etc/emacs.bash'.