Only import virtual functions when needed.

ogClient may runs on an OS that do not have all the dependencies needed
to use virtual functions.

This commit change the behaviour to only import virtual functions when
the ogClient has to work with Virtual Machines. This way ogClient works
on environments which do not need virtual functions.

src/ogRest.py

@@ -19,7 +19,6 @@ import signal
 from src.restRequest import *
 
 from src.linux.ogOperations import OgLinuxOperations
-from src.virtual.ogOperations import OgVirtualOperations, OgVM
 
 class ThreadState(Enum):
 	IDLE = 0
@@ -253,6 +252,8 @@ class ogRest():
 		if self.mode == 'linux':
 			self.operations = OgLinuxOperations(self.CONFIG)
 		elif self.mode == 'virtual':
+			from src.virtual.ogOperations import (OgVM,
+				OgVirtualOperations)
 			self.operations = OgVirtualOperations()
 			threading.Thread(target=ogThread.check_vm_state_loop,
 					 args=(self,)).start()