SICS-587 Setup hostport dictionary based configuration for dingo.

Also added simulated camera server and a camtest configuration file to
run test scans against a dummy motor.

site_ansto/instrument/dingo/hostport_config_test.tcl

@@ -0,0 +1,28 @@
+# Specify NONE for HOST and PORT if there is no fake device to talk to.
+
+# TEST MOTOR HOST AND PORT
+foreach {key host port} {
+  MC1 localhost 62300
+  MC2 localhost 62301
+  MC3 localhost 62302
+} {
+  dict set MOTOR_HOSTPORT $key HOST $host
+  dict set MOTOR_HOSTPORT $key PORT $port
+}
+
+# CAMERA SERVER
+foreach {host port} {
+  localhost 63300
+} {
+  dict set CAMERA_HOSTPORT HOST $host
+  dict set CAMERA_HOSTPORT PORT $port
+}
+
+# Safety Interlock System
+plc_simulation true
+foreach {host port} {
+  localhost 63310
+} {
+  dict set PLC_HOSTPORT HOST $host
+  dict set PLC_HOSTPORT PORT $port
+}