test/pybind/test_rados.py: fix warnings

```
2024-05-21T14:06:10.464 INFO:tasks.workunit.client.0.smithi031.stdout:../../../clone.client.0/src/test/pybind/assertions.py:2: AssertionError
2024-05-21T14:06:10.464 INFO:tasks.workunit.client.0.smithi031.stdout:=============================== warnings summary ===============================
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:../../../clone.client.0/src/test/pybind/test_rados.py:210
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:  /home/ubuntu/cephtest/clone.client.0/src/test/pybind/test_rados.py:210: DeprecationWarning: invalid escape sequence \-
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:    assert re.match('[0-9a-f\-]{36}', fsid, re.I)
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:../../../clone.client.0/src/test/pybind/test_rados.py:959
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:  /home/ubuntu/cephtest/clone.client.0/src/test/pybind/test_rados.py:959: PytestUnknownMarkWarning: Unknown pytest.mark.wait - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/mark.html
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:    @pytest.mark.wait
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:../../../clone.client.0/src/test/pybind/test_rados.py:995
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:  /home/ubuntu/cephtest/clone.client.0/src/test/pybind/test_rados.py:995: PytestUnknownMarkWarning: Unknown pytest.mark.wait - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/mark.html
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:    @pytest.mark.wait
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:
2024-05-21T14:06:10.465 INFO:tasks.workunit.client.0.smithi031.stdout:../../../clone.client.0/src/test/pybind/test_rados.py:1023
2024-05-21T14:06:10.466 INFO:tasks.workunit.client.0.smithi031.stdout:  /home/ubuntu/cephtest/clone.client.0/src/test/pybind/test_rados.py:1023: PytestUnknownMarkWarning: Unknown pytest.mark.wait - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/mark.html
2024-05-21T14:06:10.466 INFO:tasks.workunit.client.0.smithi031.stdout:    @pytest.mark.wait
2024-05-21T14:06:10.466 INFO:tasks.workunit.client.0.smithi031.stdout:
```

Signed-off-by: Matan Breizman <[email protected]>

Author: Matan-B

src/test/pybind/pytest.ini

@@ -7,3 +7,4 @@ markers =
     stats
     tier
     watch
+    wait

src/test/pybind/test_rados.py

@@ -207,7 +207,7 @@ def test_get_pool_base_tier(self):
 
     def test_get_fsid(self):
         fsid = self.rados.get_fsid()
-        assert re.match('[0-9a-f\-]{36}', fsid, re.I)
+        assert re.match(r'[0-9a-f\-]{36}', fsid, re.I)
 
     def test_blocklist_add(self):
         self.rados.blocklist_add("1.2.3.4/123", 1)