tests/acceptance: Disable the rx sash and arm cubieboard replay test on Gitlab

These tests always time out on Gitlab, not sure what's happening here.
Let's disable them until somebody has enough spare time to debug the
issues.

Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Reviewed-by: Cleber Rosa <crosa@redhat.com>
Message-Id: <20200730141326.8260-3-thuth@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/acceptance/machine_rx_gdbsim.py

@@ -8,6 +8,9 @@
 # This work is licensed under the terms of the GNU GPL, version 2 or
 # later.  See the COPYING file in the top-level directory.
 
+import os
+
+from avocado import skipIf
 from avocado_qemu import Test
 from avocado_qemu import exec_command_and_wait_for_pattern
 from avocado_qemu import wait_for_console_pattern
@@ -42,6 +45,7 @@ class RxGdbSimMachine(Test):
         # FIXME limit baudrate on chardev, else we type too fast
         #exec_command_and_wait_for_pattern(self, 'version', gcc_version)
 
+    @skipIf(os.getenv('GITLAB_CI'), 'Running on GitLab')
     def test_linux_sash(self):
         """
         Boots a Linux kernel and checks that the console is operational.

tests/acceptance/replay_kernel.py

@@ -126,6 +126,7 @@ class ReplayKernel(LinuxKernelTest):
 
         self.run_rr(kernel_path, kernel_command_line, console_pattern, shift=1)
 
+    @skipIf(os.getenv('GITLAB_CI'), 'Running on GitLab')
     def test_arm_cubieboard_initrd(self):
         """
         :avocado: tags=arch:arm