Bug 573960 - POM and product version change for 4.21 release

Change-Id: Ie9fae5f271d97acb1d61c42bbf59f69b0fe0b209
Signed-off-by: Sravan Kumar Lakkimsetti <sravankumarl@in.ibm.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.resources/+/181375
14 files changed