Update fisheye to version 3.9.1

Update our Fisheye instance from current 3.6.3 to latest 3.9.x version containing mainly performance improvements.

• https://confluence.atlassian.com/fisheye/fisheye-3-7-release-notes-697140979.html
• https://confluence.atlassian.com/fisheye/fisheye-3-8-release-notes-732530148.html
• https://confluence.atlassian.com/fisheye/fisheye-3-9-release-notes-765397604.html

Note that support for Java 7 has been deprecated in FishEye 3.7 and completely removed in 3.9 so we have to upgrade to Java 8