support/testing: large timeout for login prompt

When running multiple instances of emulator in parallel, the login
prompt can take some time to appear.

Use a large timeout when waiting for the prompt to avoid random
failures.
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

support/testing/infra/emulator.py

@@ -72,8 +72,10 @@ class Emulator(object):
     # Wait for the login prompt to appear, and then login as root with
     # the provided password, or no password if not specified.
     def login(self, password=None):
+        # The login prompt can take some time to appear when running multiple
+        # instances in parallel, so set the timeout to a large value
         index = self.qemu.expect(["buildroot login:", pexpect.TIMEOUT],
-                                 timeout=10)
+                                 timeout=60)
         if index != 0:
             self.logfile.write("==> System does not boot")
             raise SystemError("System does not boot")