Improve vmrun error messages

gns3server/compute/vmware/__init__.py

@@ -390,12 +390,12 @@ class VMware(BaseManager):
             try:
                 stdout_data, _ = yield from asyncio.wait_for(process.communicate(), timeout=timeout)
             except asyncio.TimeoutError:
-                raise VMwareError("vmrun has timed out after {} seconds!".format(timeout))
+                raise VMwareError("vmrun has timed out after {} seconds!\nTry to run {} in a terminal to see more informations.".format(timeout, command_string))
 
             if process.returncode:
                 # vmrun print errors on stdout
                 vmrun_error = stdout_data.decode("utf-8", errors="ignore")
-                raise VMwareError("vmrun has returned an error: {}".format(vmrun_error))
+                raise VMwareError("vmrun has returned an error: {}\nTry to run {} in a terminal to see more informations.".format(vmrun_error, command_string))
 
             return stdout_data.decode("utf-8", errors="ignore").splitlines()