WIP Add migration tests for zfs-ng

Those are copied from the zfs tests.

TODO: test them

tests/storage/zfs_ng/test_zfs_sr_crosspool_migration.py

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+import pytest
+from tests.storage import cold_migration_then_come_back, live_storage_migration_then_come_back
+
+# Requirements:
+# From --hosts parameter:
+# - host(A1): first XCP-ng host >= 8.2 with an additional unused disk for the SR.
+# - hostB1: Master of a second pool. Any local SR.
+# From --vm parameter
+# - A VM to import to the ZFS-ng SR
+# And:
+# - access to XCP-ng RPM repository from hostA1
+
+@pytest.mark.small_vm # run with a small VM to test the features
+@pytest.mark.big_vm # and ideally with a big VM to test it scales
+@pytest.mark.usefixtures("hostB1", "local_sr_on_hostB1")
+class Test:
+    def test_cold_crosspool_migration(self, host, hostB1, vm_on_zfs_sr, zfs_sr, local_sr_on_hostB1):
+        cold_migration_then_come_back(vm_on_zfs_sr, host, zfs_sr, hostB1, local_sr_on_hostB1)
+
+    def test_live_crosspool_migration(self, host, hostB1, vm_on_zfs_sr, zfs_sr, local_sr_on_hostB1):
+        live_storage_migration_then_come_back(vm_on_zfs_sr, host, zfs_sr, hostB1, local_sr_on_hostB1)

tests/storage/zfs_ng/test_zfs_sr_intrapool_migration.py

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+import pytest
+from tests.storage import cold_migration_then_come_back, live_storage_migration_then_come_back
+
+# Requirements:
+# From --hosts parameter:
+# - host(A1): first XCP-ng host >= 8.2 with an additional unused disk for the SR.
+# - hostA2: Second member of the pool. Can have any local SR. No need to specify it on CLI.
+# From --vm parameter
+# - A VM to import to the ZFS-ng SR
+# And:
+# - access to XCP-ng RPM repository from hostA1
+
+@pytest.mark.small_vm # run with a small VM to test the features
+@pytest.mark.big_vm # and ideally with a big VM to test it scales
+@pytest.mark.usefixtures("hostA2", "local_sr_on_hostA2")
+class Test:
+    def test_cold_intrapool_migration(self, host, hostA2, vm_on_zfs_sr, zfs_sr, local_sr_on_hostA2):
+        cold_migration_then_come_back(vm_on_zfs_sr, host, zfs_sr, hostA2, local_sr_on_hostA2)
+
+    def test_live_intrapool_migration(self, host, hostA2, vm_on_zfs_sr, zfs_sr, local_sr_on_hostA2):
+        live_storage_migration_then_come_back(vm_on_zfs_sr, host, zfs_sr, hostA2, local_sr_on_hostA2)