[TASK] Remove install tool fluid / extbase upgrade wizard

Since extbase and fluid are required extensions now, the
upgrade wizard that installed those two is obsolete.

Change-Id: I8055665355f2ac7726c8803824741d2dd3277f3d
Resolves: 35860
Releases: 6.0
Reviewed-on: http://review.typo3.org/10246
Reviewed-by: Wouter Wolters
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn