Add to the IntelliJ Git Window issue navigation links to Cassandra's Jira

It is possible to navigate from the IntelliJ IDEA Git window to a corresponding Cassandra issue, the Apache Jira if mentioned in the git message. The example in the attachments shows how CASSANDRA-* letters are turned on in the commit message to an appropriate Cassandra Jira link.

We should update the IntelliJ IDEA configuration and make this behaviour a default for the ant generate-idea-files process.

To achieve this manually you can update your .idea/vcs.xml file in the Cassandra project with the following:

<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$" vcs="Git" />
</component>
<component name="IssueNavigationConfiguration">
<option name="links">
<list>
<IssueNavigationLink>
<option name="issueRegexp" value="CASSANDRA-(\d+)" />
<option name="linkRegexp"value="https://issues.apache.org/jira/browse/CASSANDRA-$1"/>
</IssueNavigationLink>
</list>
</option>
</component>
</project>