Echo that qemu-img convert is running
Echo that qemu-img convert is running

qemu-img convert can take a few minutes to complete, or far longer
on heavily loaded systems. Notify the user that the image is
undergoing conversion to save them just seeing END PROFILING.

Change-Id: I1ad61ce5ed011b721d48e2d12fb42ef4aa5cd1f6

rdo-management/diskimage-builder,openstack/diskimage-builder,takahashinobuyuki/diskimage-builder,NaohiroTamura/diskimage-builder,eantyshev/diskimage-builder,openstack/diskimage-builder,eantyshev/diskimage-builder,rdo-management/diskimage-builder,NaohiroTamura/diskimage-builder,takahashinobuyuki/diskimage-builder,varunarya10/diskimage-builder,zioproto/diskimage-builder,switch-ch/diskimage-builder,CSC-IT-Center-for-Science/diskimage-builder,JioCloud/diskimage-builder,switch-ch/diskimage-builder,CSC-IT-Center-for-Science/diskimage-builder,varunarya10/diskimage-builder,zioproto/diskimage-builder,JioCloud/diskimage-builder