To check a change's state the caller currently has to call getState()
and then do a comparison on the enum value.
To make this easier, introduce new methods on Change:
- isNew
- isMerged
- isAbandoned
- isClosed
Note that we don't add "isOpen" since there are no longer multiple
states that could be considered "open". Previously there were "new"
and "draft", but the draft workflow was removed.
Update callers to use the new methods.
Change-Id: Ic047f74b114e2277e66c878dace73ea8e0babab6
4c58e1031f