reports: changed DejaVu Sans font to SansSerif family (#901418)

This is to fully support non latin fonts.

Bug-Url: https://bugzilla.redhat.com/901418

Change-Id: Idce54abe8b0449b03db4b60eca38947490ede0ac
Signed-off-by: Yaniv Dary <ydary@redhat.com>