RFR: Add support for Resolved issue state

[Erik Helin]

On Tue, 3 Dec 2019 14:40:17 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

>> issuetracker/src/main/java/org/openjdk/skara/issuetracker/Issue.java line 107:
>> 
>>> 106:         OPEN,
>>> 107:         RESOLVED,
>>> 108:         CLOSED
>> 
>> Another option would be to simply map CLOSED to the Jira Resolved state as that's probably what we want to always use..
> 
> Jira also supports renaming its states, so it's possible that we'll need to switch to setting State as a string to be interpreted as the particular Issue implementation sees fit.

I think using `RESOLVED` makes sense for now ��

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PR: https://git.openjdk.java.net/skara/pull/285