releng: Use features instead of Eclipse product in target/targlet

In order to work around
https://bugs.eclipse.org/bugs/show_bug.cgi?id=539902

Also update the target to make it closer to the Oomph setup.

Change-Id: Ie581ea499d7cd0956780717f3a34e0762f868c0d
Signed-off-by: Marc-Andre Laperle <malaperle@gmail.com>
2 files changed