Reinstate /mnt redirection of jenkins - HPCS cloud images have a very restricted /.
Reinstate /mnt redirection of jenkins - HPCS cloud images have a very
restricted /.

juicegit/diskimage-builder,juicegit/diskimage-builder,juicegit/diskimage-builder,switch-ch/diskimage-builder,zioproto/diskimage-builder,agroup/tripleo-puppet-elements,varunarya10/diskimage-builder,openstack/tripleo-image-elements,agroup/tripleo-puppet-elements,agroup/tripleo-puppet-elements,NaohiroTamura/diskimage-builder,NaohiroTamura/diskimage-builder,switch-ch/diskimage-builder,juicegit/diskimage-builder,openstack/diskimage-builder,qwefi/tripleo-image-elements,juicegit/diskimage-builder,rdo-management/diskimage-builder,eantyshev/diskimage-builder,citrix-openstack-build/diskimage-builder,zioproto/diskimage-builder,openstack/diskimage-builder,rdo-management/tripleo-image-elements,rdo-management/diskimage-builder,radez/tripleo-image-elements,qwefi/tripleo-image-elements,citrix-openstack-build/diskimage-builder,takahashinobuyuki/diskimage-builder,eantyshev/diskimage-builder,rdo-management/tripleo-image-elements,takahashinobuyuki/diskimage-builder,JioCloud/diskimage-builder,openstack/tripleo-image-elements,JioCloud/diskimage-builder,CSC-IT-Center-for-Science/diskimage-builder,agroup/tripleo-puppet-elements,qwefi/tripleo-image-elements,qwefi/tripleo-image-elements,varunarya10/diskimage-builder,qwefi/tripleo-image-elements,radez/tripleo-image-elements,CSC-IT-Center-for-Science/diskimage-builder