Improve information provided on failed linkage progress

Linkage algorithm seems to have a issue with a set of proprietary
models. Rather than throwing a simple exception, add debug logging
to track which items progress and report any remaining items as
suppressed exceptions.

Change-Id: Ia7f1efe498f1ac82de35facf0188d0a2972e2b09
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>