Preliminary unfinished version of device service and Context API based on...

Preliminary unfinished version of device service and Context API based on Redis. To be finished, it is just a backup.

src/device/tests/tools/ValidateTopology.py

+def validate_topology_dict(topology):
+    assert type(topology) is dict
+    assert len(topology.keys()) > 0
+    assert 'topoId' in topology
+    assert 'device' in topology
+    assert 'link' in topology