userportal : Events sorting - oldest first

Incorrect sorting of events in user portal.
The events are not sorted in any particular order
resulting in newer events being displayed after
older ones.

Change-Id: I93eeae05af9d07ad1fea0f3ee9c0dee9c8023f81
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=907421
Signed-off-by: Ravi Nori <rnori@redhat.com>