perf completion: Rename file to reflect zsh support

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/1384704807-15779-6-git-send-email-artagnon@gmail.com


[ Fix 'make install' target ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>