webadmin: search paging on event log does not use paging correctly

search paging on event log does not use paging
correctly If we browse to 2nd page from UI Events
TAB by pressing the '>' button and then put
"Vms: page 1" as the search text , we an error
on server side

Change-Id: I86787302601365e07f9d923f26d483c7bceb30ef
Bug-Url: https://bugzilla.redhat.com/1064395
Signed-off-by: Ravi Nori <rnori@redhat.com>