Add test for new multidiscrete spaces

tests/config/multidiscrete_obs_space_laydown_config.yaml

@@ -0,0 +1,31 @@
+- itemType: ACTIONS
+  type: NODE
+- itemType: OBSERVATIONS
+  type: MULTIDISCRETE
+- itemType: STEPS
+  steps: 5
+- itemType: PORTS
+  portsList:
+  - port: '21'
+- itemType: SERVICES
+  serviceList:
+  - name: ftp
+- itemType: NODE
+  node_id: '1'
+  name: node
+  node_class: SERVICE
+  node_type: COMPUTER
+  priority: P1
+  hardware_state: 'ON'
+  ip_address: 192.168.0.1
+  software_state: GOOD
+  file_system_state: GOOD
+  services:
+  - name: ftp
+    port: '21'
+    state: GOOD
+- itemType: POSITION
+  positions:
+  - node: '1'
+    x_pos: 309
+    y_pos: 78