cnf: update to latest bndtools status

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Use a consistent version of osgi.core

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Upgrade to osgi.core version 4.3.1

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>