Bug 573960 - POM and product version change for 4.21 release

Change-Id: Ie5a9f275f2f1c4766d373bea462cdf4c45346ee2
Signed-off-by: Sravan Kumar Lakkimsetti <sravankumarl@in.ibm.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.ua/+/181369
15 files changed