git p4: bring back files in deleted client directory

git p4: bring back files in deleted client directory

The code to auto-create the client directory, added in 0591cfa
(git-p4: ensure submit clientPath exists before chdir,
2011-12-09), works when the client directory never existed.

But if the directory is summarily removed without telling p4,
the sync operation will not bring back all the files.  Always
do "sync -f" if the client directory is newly created.

Reported-by: Gary Gibbons <ggibbons@perforce.com>
Signed-off-by: Pete Wyckoff <pw@padd.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>