Since I6c5a962260741dcf6f89da9a33b96372a719b7b0 dib has had a
standardised method for ensuring consistency of tracing and error
detection. Bring the tracing for these elements up to that standard,
but maintain the status-quo of flags such as "-e" and "pipefail" by
adding ignore flags where appropriate (we can update these separately
to avoid breakage)
Other minor changes are alphabetical-ordering in the element-deps
files and permissions on prepare-node script
With this, "tox -edib" passes
Change-Id: Ibba1dadb9e819f94294c9d583b83ff698252f93f
90c53a8ded