Handle notification reception on port state change

Handle notification reception on port state change

- implement reception of a changeNotification on DeviceListener221 when
a device port state change
- rename DeviceListener to DeviceListener121 and align its
implementation on the DeviceListener221 one
- add a new DeviceListener710 with the same implementation of other
device listeners
- refactor all the NetconfTopologyListener class to remove technical
debts after extension to DeviceListener221 and DeviceListener710
- refactor NetconfTopologyListenerTest UT to be aligned with the new
implementation

JIRA: TRNSPRTPCE-422
Signed-off-by: Gilles Thouenon <gilles.thouenon@orange.com>
Change-Id: I7af3073071e47383dbf8629d261c7d07a8113e91