We were seeing false positives when diffing charts to determine
whether an upgrade was necessary. Previously we were serializing the
charts and values and diffing those, but these serializations often
output things in different and non-deterministic order, hence the
false positives. This removes the ordering concerns by puttings things
in maps instead of lists, and comparing those semantically rather than
via serialization. This also improves the diff output to be easier to
read. It also stops caring about diffs in Chart.yaml.
Change-Id: I4c92c2e7c814178c374623ea52d717bdb9f72b11
5c5ddf8e8c