Remove version mismatch in config.version

 - End goal was to remove several config.version present in the pom, in
 the making i cleaned some of the repetition in config parent pom and
 aligned with the commons.opendaylight
- Removed some more warning on the pom files

Change-Id: I6717ceb915fe90fa7313472eb03884de9d09235d
Signed-off-by: Giovanni Meo <gmeo@cisco.com>