Remove old dependencies

- Remove stale dependencies that prevent releasing of artifacts
- Remove unused flow-management-compatibility and
inventory-topology-compatibility modules
- Make sure that if a dependency is on module with a version defined
by a variable, lets specify the version in the dependency management
in common pom
- Replace in netconf-cli the reference from yang-data-json to
yang-data-composite-node because yang-data-json has been removed
- Removed whitespaces in config-netty-config that would cause
checkstyle issues downstream otherwise

Change-Id: I866e4b36e71c004b925bd181412ff4df91b3091f
Signed-off-by: Giovanni Meo <gmeo@cisco.com>