Added waiting for periodicprint in some coreboot tests.
Added waiting for periodicprint in some coreboot tests.

mslovy/barrelfish,mslovy/barrelfish,BarrelfishOS/barrelfish,8l/barrelfish,8l/barrelfish,utsav2601/cmpe295A,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,utsav2601/cmpe295A,mslovy/barrelfish,mslovy/barrelfish,BarrelfishOS/barrelfish,mslovy/barrelfish,mslovy/barrelfish,BarrelfishOS/barrelfish,utsav2601/cmpe295A,kishoredbn/barrelfish,kishoredbn/barrelfish,utsav2601/cmpe295A,8l/barrelfish,kishoredbn/barrelfish,kishoredbn/barrelfish,utsav2601/cmpe295A,kishoredbn/barrelfish,8l/barrelfish,kishoredbn/barrelfish,BarrelfishOS/barrelfish,utsav2601/cmpe295A,8l/barrelfish,8l/barrelfish,BarrelfishOS/barrelfish