libyaml now needs to Loader keyword to not throw a warning, use
safe_load instead everywhere.
sort_keys isn't supported for reasons surpassing understanding, so
switch to ruamel.yaml for the places where we write contents back
out.
Our ruamel.yaml wrapper strips extra leading space, which is needed
when the root object is a list. When the root object is NOT a list,
it's not needed. Add a flag to the constructor to toggle the
behavior.
For gerrit/projects.yaml this leads to a different wrapping of
description fields, which is included here.
Let ruamel.yaml handle comments
Since we've switched to ruamel.yaml, we don't need to strip
comments. Stop stripping them. Intra-list comments aren't
supported, so just remove them.
Please don't ask me why we can't have a space before openstack-merlin.
Change-Id: I72776774eabd4e397ee5e8bdd58b3632be8fd3a1
Ensure that the output of tools/normalize_channels_yaml.py matches
gerritbot/channels.yaml modulo any comments.
Change-Id: I3147cb094a795aeeffcceda182d065ed5145c2dd
Depends-On: Ia710997f37e8fba4a18b26577ecac42dd3137e2a