No longer install git-svnimport, move to contrib/examples

This has been proposed for a few times without much reaction
from the list.  Actually remove it to see who screams.

Signed-off-by: Gerrit Pape <pape@smarden.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -346,7 +346,6 @@ __git_commands ()
 		ssh-*)            : transport;;
 		stripspace)       : plumbing;;
 		svn)              : import export;;
-		svnimport)        : import;;
 		symbolic-ref)     : plumbing;;
 		tar-tree)         : deprecated;;
 		unpack-file)      : plumbing;;