Current revision api only exposes getter methods for comments and drafts
that return Map<String, List<CommentInfo>> with unset path attribute in
CommentInfo container.
While this is fine for the need of change screen, that leads to
obfuscated client code when only list of comments is needed:
1. call gApi.changes().id(changeId).revision(rev).comments()
2. iterate over the result map
2.1. retrieve the key
2.2. set path attribute in the CommentInfo container
3. create, fill and return result list of CommentInfo instances with
re-filled path attribute.
This change offers missing methods that return list of comment infos
with filled path attributes.
Change-Id: Ie154c772f27dc601049cdddffb0c35a20f3f03e9
20a5470650