Import VNA_dummy in virtual_time file and introduced it in virtual_clock class

Python_script/virtual_time.py

 import time
 import shared_simulated_state
 import climate_chamber_dummy
+import VNA_dummy
+
 
 # A single global instance of the virtual clock is used and returned whenever cet_clock is called
 virtual_clock_instance = None
@@ -24,6 +26,7 @@ class VirtualClock:
     def __init__(self, target_accuracy):
         self.simulated_state = shared_simulated_state.get_simulated_state()
         self.climate_chamber_dummy = climate_chamber_dummy.get_climate_chamber_dummy(target_accuracy)
+        self.VNA_dummy = VNA_dummy.get_vna_dummy()
 
     def time(self):
         return self.simulated_state.simulated_time
@@ -31,6 +34,7 @@ class VirtualClock:
     def sleep(self, sleep_time):
         self.simulated_state.simulated_time += sleep_time
         self.climate_chamber_dummy.run_simulation()
+        self.VNA_dummy.run_simulation()
 
 
 class RealClock: