Update to Jira 6.3.15
Update to Jira 6.3.15

Release notes:
https://confluence.atlassian.com/display/JIRA/JIRA+6.3.15+Release+Notes
Changelog:
https://jira.atlassian.com/projects/JRA/versions/50826

ahaasler/docker-jira,yunhaia/docker-jira