Don't implement a custom migration routine at PpcMigrationTest and
instead reuse the generic one from MigrationTest.

This removes the dependency of PpcMigrationTest from
PseriesMachine. Having one test import another causes unittest code to
instantiate the imported test, resulting in the setup and teardown
methods being invoked for the imported test class, even if no test
from that class will be executed.

If run in parallel, the extra setup/teardown methods that result from
importing can race with the ones from the actual test being executed
and cause the following error:

File "<SRC_DIR>/tests/functional/qemu_test/testcase.py", line 238, in tearDown
shutil.rmtree(self.workdir)
...
FileNotFoundError: [Errno 2] No such file or directory:
'<SRC_DIR>/build/tests/functional/ppc64/.../test_migration_with_exec/scratch'

Fixes: f4e34d0fd5 ("tests/functional: Add a OS level migration test for pseries")
Reported-by: Aditya Gupta <adityag@linux.ibm.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
 tests/functional/migration.py            |  4 ++--
 tests/functional/ppc64/test_migration.py | 11 -----------
 tests/functional/ppc64/test_pseries.py   |  6 ++++--
 3 files changed, 6 insertions(+), 15 deletions(-)

diff --git a/tests/functional/migration.py b/tests/functional/migration.py
index ac6feeeefb..008be67d3f 100644
--- a/tests/functional/migration.py
+++ b/tests/functional/migration.py
@@ -65,10 +65,10 @@ def _get_free_port(self, ports):
             self.skipTest('Failed to find a free port')
         return port
 
-    def migration_with_tcp_localhost(self):
+    def migration_with_tcp_localhost(self, src_vm=None, dst_vm=None):
         with Ports() as ports:
             dest_uri = 'tcp:localhost:%u' % self._get_free_port(ports)
-            self.do_migrate(dest_uri)
+            self.do_migrate(dest_uri, source_vm=src_vm, dest_vm=dst_vm)
 
     def migration_with_unix(self):
         dest_uri = 'unix:%s/migration.sock' % self.socket_dir().name
diff --git a/tests/functional/ppc64/test_migration.py b/tests/functional/ppc64/test_migration.py
index a3b819680b..7d49ee175b 100755
--- a/tests/functional/ppc64/test_migration.py
+++ b/tests/functional/ppc64/test_migration.py
@@ -22,17 +22,6 @@ def test_migration_with_exec(self):
         self.set_machine('mac99')
         self.migration_with_exec()
 
-    def do_migrate_ppc64_linux(self, source_vm, dest_vm):
-        with Ports() as ports:
-            port = ports.find_free_port()
-            if port is None:
-                self.skipTest('Failed to find a free port')
-            uri = 'tcp:localhost:%u' % port
-
-            dest_vm.qmp('migrate-incoming', uri=uri)
-            source_vm.qmp('migrate', uri=uri)
-            self.assert_migration(source_vm, dest_vm)
-
 
 if __name__ == '__main__':
     MigrationTest.main()
diff --git a/tests/functional/ppc64/test_pseries.py b/tests/functional/ppc64/test_pseries.py
index b45763c305..368c85762e 100755
--- a/tests/functional/ppc64/test_pseries.py
+++ b/tests/functional/ppc64/test_pseries.py
@@ -9,7 +9,7 @@
 
 from qemu_test import QemuSystemTest, Asset
 from qemu_test import wait_for_console_pattern
-from test_migration import PpcMigrationTest
+from migration import MigrationTest
 
 class PseriesMachine(QemuSystemTest):
 
@@ -116,7 +116,9 @@ def test_ppc64_linux_migration(self):
         wait_for_console_pattern(self, console_pattern, self.panic_message,
                                  vm=source_vm)
 
-        PpcMigrationTest().do_migrate_ppc64_linux(source_vm, dest_vm);
+        mt = MigrationTest()
+        mt.timeout = self.timeout
+        mt.migration_with_tcp_localhost(source_vm, dest_vm);
 
         # ensure the boot proceeds after migration
         wait_for_console_pattern(self, self.good_message, self.panic_message,
-- 
2.51.0