s3: winbindd: Add new parameter "winbind request timeout" set to 60 seconds with...

s3: winbindd: Add new parameter "winbind request timeout" set to 60 seconds with man page.

"This parameter specifies the number of seconds the winbindd
daemon will wait before disconnecting either a client connection
with no outstanding requests (idle) or a client connection with a
request that has remained outstanding (hung) for longer than this
number of seconds."

Bug 3204 winbindd: Exceeding 200 client connections, no idle connection found

https://bugzilla.samba.org/show_bug.cgi?id=3204

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ira Cooper <ira@samba.org>