Bug 573960 - POM and product version change for 4.21 release

Change-Id: I51b5c202fedf647b337a89eaa5fb392a1c14beae
Signed-off-by: Sravan Kumar Lakkimsetti <sravankumarl@in.ibm.com>
Reviewed-on: https://git.eclipse.org/r/c/equinox/rt.equinox.bundles/+/181365
66 files changed