packaging: Use different timestamps for log rotation.

This patch fixes the log rotation. Now different timestamps will be used
for each rotated log.
This is fix related to 7902858f6c8d1d3d8f2b40a7d5bdf229f3d47689

Change-Id: Ief4bce003f1649a4d1ca75156bdf9cc8d2c848e9
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=889751
Signed-off-by: Kiril Nesenko <knesenko@redhat.com>