Investigate if Jira client update_issue_field method also works with status and labels

[leplatrem]

Currently we use at least 3 methods to set Jira issues fields:

• set_issue_status()
• update_issue()
• update_issue_field()

If we could use update_issue_field() for all, we could refactor and optimize API calls.

For status, transitions are implied, which may not allow to use arbitrary updates methods...

https://github.com/atlassian-api/atlassian-python-api/blob/0a5bc5ee72427be0ec16ce5db4f4b091f7a00ddc/atlassian/jira.py#L1768-L1775

See #889