Devices infrastructure and minimal server

starts and creates (server-side) devices
no daemonizing and servicing yet

hint: try starting:
$ bin/server.py -v start

Change-Id: I6ac7a78dfff309a459cc0338a8d0d319ee72ada5

etc/test.cfg

@@ -0,0 +1,16 @@
+[server]
+bindto=localhost
+bindport=10767
+protocol=pickle
+
+[device LN2]
+class=devices.test.LN2
+
+[device heater]
+class=devices.test.Heater
+maxheaterpower=10
+
+[device T1]
+class=devices.test.Temp
+sensor="X34598T7"
+