tests/avocado: Make ssh_command_output_contains() globally available

This function will be useful in other tests, too, so move it to the
core LinuxSSHMixIn class.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20230421110345.1294131-2-thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230424092249.58552-9-alex.bennee@linaro.org>

tests/avocado/avocado_qemu/__init__.py

@@ -431,6 +431,14 @@ class LinuxSSHMixIn:
                          f'Guest command failed: {command}')
         return stdout_lines, stderr_lines
 
+    def ssh_command_output_contains(self, cmd, exp):
+        stdout, _ = self.ssh_command(cmd)
+        for line in stdout:
+            if exp in line:
+                break
+        else:
+            self.fail('"%s" output does not contain "%s"' % (cmd, exp))
+
 class LinuxDistro:
     """Represents a Linux distribution
 

tests/avocado/linux_ssh_mips_malta.py

@@ -101,14 +101,6 @@ class LinuxSSH(QemuSystemTest, LinuxSSHMixIn):
         self.ssh_disconnect_vm()
         wait_for_console_pattern(self, 'Power down', 'Oops')
 
-    def ssh_command_output_contains(self, cmd, exp):
-        stdout, _ = self.ssh_command(cmd)
-        for line in stdout:
-            if exp in line:
-                break
-        else:
-            self.fail('"%s" output does not contain "%s"' % (cmd, exp))
-
     def run_common_commands(self, wordsize):
         self.ssh_command_output_contains(
             'cat /proc/cpuinfo',