yangtools cannot release, so fixing it

- yangtools cannot release because the projetc.version dependency in
  dependency management keep changing with the project that includes it,
  so fixing it
- restconf dependency and other version should not be duplicated in
  multiple poms
- the version property in the common/parent/pom.xml file need to be
  the authoritative versions else the features file cannot relay on it

Change-Id: Ic99c1f3818efbdf6ff9c514d4c842164d4228fc4
Signed-off-by: Giovanni Meo <gmeo@cisco.com>
Merge "yangtools cannot release, so fixing it"