core: Fixing events search with from keyword

using from filter in an event search doesn't work

Restoring support of 'from' clause for event search.

Change-Id: I1c31ae7953fa4921fd912e4a7b94d3081d4e09a1
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1131030
Signed-off-by: Eli Mesika <emesika@redhat.com>