Fix JiraVersionCreator already existing detection

Use the expanded version instead the raw string to detect that a version
already exists in JIRA.
One more usage of jiraVersion down

Another case of the non-expanded jiraVersion being used instead of
realVersion
Add an unit test for the expansion
Merge pull request #35 from RFQ-hub/always_expand_jira_version

"Create a JIRA Version" is using the non-expanded version string to search for an existing one