Basic wall clock profiling per element script.
Basic wall clock profiling per element script.

Change-Id: I43f90574ac716f2ef22949c0fe4fa2e7fc84348e

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