Merge pull request #940 from adrian-rosello/refactor/rename-switch-monitoringcapab

Rename ofswitch monitoring capability to portstatistics.
Use new name in log.
Apply renaming into Activator.
Network Port Statistics skeleton.
Update netconf-server version and fix poms
Merge pull request #946 from adrian-rosello/develop

Update netconf-server version and fix poms
Merge branch 'develop' of https://github.com/dana-i2cat/opennaas into refactor/rename-monitoring-capab
Merge branch 'ofertie/monitoring' of https://github.com/dana-i2cat/opennaas into refactor/rename-monitoring-capab
Merge pull request #947 from adrian-rosello/refactor/rename-monitoring-capab

Merge Develop into Monitoring-Capab
Merge pull request #949 from logoff/ofertie/net-port-stats

Network Port Statistics capability skeleton

And some improvements in ofswitch Port Statistics Capability.
Merge branch 'ofertie/monitoring' into feature/port-statistics-monitoring
Merge branch 'ofertie/monitoring' into feature/port-statistics-monitoring