Ignore errors when ldd'ing static binaries.
Ignore errors when ldd'ing static binaries.

When trying to get the library dependencies from a static program
it fails and die.
This scapes the error and continue with the execution.

Change-Id: Id3463f2dd77a182ce4f9d9d28165d35f17806892

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