releng: Bump versions of parent modules

releng: Bump versions of parent modules

To make it clearer that this is targetting 2.0.0 release, bump the parent
modules to 2.0.0. We technically don't need to do that but it's less confusing
to see 2.0.0 when building from the top level.

Change-Id: Ie0b407ce726df749351dfba8aa0efdc9aa58b75a
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/51069
Reviewed-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Tested-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-by: Hudson CI