[PATCH for-7.2] tests/avocado/boot_linux.py: Bump aarch64 virt test timeout to 720s

[Peter Maydell]

The two tests
tests/avocado/boot_linux.py:BootLinuxAarch64.test_virt_tcg_gicv2
tests/avocado/boot_linux.py:BootLinuxAarch64.test_virt_tcg_gicv3

take quite a long time to run, and the current timeout of 240s
is not enough for the tests to complete on slow machines:
we've seen these tests time out in the gitlab CI in the
'avocado-system-alpine' CI job, for instance. The timeout
is also insufficient for running the test with a debug build
of QEMU: on my machine the tests take over 10 minutes to run
in that config.

Push the timeout up to 720s so that the test definitely has
enough time to complete.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 tests/avocado/boot_linux.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/avocado/boot_linux.py b/tests/avocado/boot_linux.py
index 571d33882ae..32adae6ff6a 100644
--- a/tests/avocado/boot_linux.py
+++ b/tests/avocado/boot_linux.py
@@ -64,7 +64,7 @@ class BootLinuxAarch64(LinuxTest):
     :avocado: tags=machine:virt
     :avocado: tags=machine:gic-version=2
     """
-    timeout = 240
+    timeout = 720
 
     def add_common_args(self):
         self.vm.add_args('-bios',
-- 
2.25.1