test: Call Microvm.wait_for_up if using config file

If we start Firecracker with a config file, then the microvm will boot
in `.spawn()` instead of `.start()` (since we are not driving
Firecracker via API requests). Thus, if this is the case, put the
`wait_for_up` into `Microvm.spawn()`.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

tests/framework/microvm.py

@@ -653,6 +653,8 @@ def spawn(
         # and leave 0.2 delay between them.
         if "no-api" not in self.jailer.extra_args:
             self._wait_create()
+        if "config-file" in self.jailer.extra_args and self.iface:
+            self.wait_for_up()
         if self.log_file and log_level in ("Trace", "Debug", "Info"):
             self.check_log_message("Running Firecracker")