I commonly get asked for help when people are attempting to create
local image elements and they cannot get them to work.
diskimage-builder silently ignores element scripts that it doesn't
find to it's liking, such as non-executable or files with extensions
(.sh is a common mistake).
This patch extends the '-x' tracing flag down to dib-run-parts and
will cause it to print out helpful messages when these files would
otherwise be silently ignored.
Examples:
Ignoring non-executable files: 10-do-not-run-me
Ignoring non-conforming filenames: 10-I-can-run.sh
I am not enabling these by default as they can create extra noise
and require additional filesystem IO to produce.
Change-Id: Ic804efca3015c199440b4b10da951d71a815c64f
824042d608