Ensure that Flocker issues remain accessible

[wallrj]

Issues are at https://clusterhq.atlassian.net

• Copy all issues so that FLOC- references in closed PRs can be looked up.
• Copy attachments if possible (log archives, screenshots, etc)
• As much issue metadata, within reason. (timestamps, author, change history, )
• Convert markup from Jira to GitHub wiki format

Issues can be downloaded from Jira in batches of 200

• https://developer.atlassian.com/jiradev/jira-apis/jira-rest-apis/jira-rest-api-tutorials/jira-rest-api-example-query-issues

  curl --dump-header - --user wallrj:**** -X GET -H "Content-Type: application/json" 'https://clusterhq.atlassian.net/rest/api/2/search?jql=project=FLOC' > issues.json