Add fallback link for Maven in Travis dependencies
Add fallback link for Maven in Travis dependencies

Signed-off-by: Claudio Mezzasalma <acdb73fa11473662b10f45613ec005f8be976786@eurotech.com>

stzilli/kapua,stzilli/kapua,LeoNerdoG/kapua,stzilli/kapua,LeoNerdoG/kapua,LeoNerdoG/kapua,stzilli/kapua,stzilli/kapua,LeoNerdoG/kapua,LeoNerdoG/kapua