Incorrect path to user data file in "pkggen.py"

[Ai Hamano]

When trying to create a VNF package using the following "pkggen.py", an error occurs and it cannot be created.
* https://opendev.org/openstack/tacker/src/branch/stable/2024.1/samples/tests/functional/sol_v2_common/basic_lcms_max_individual_vnfc/pkggen.py

[Operation]
```
$ export PYTHONPATH=/opt/stack/tacker
$ cd /opt/stack/tacker/samples/tests/functional/sol_v2_common/basic_lcms_max_individual_vnfc
$ python3 pre.py
$ python3 pkggen.py
Traceback (most recent call last):
  File "/opt/stack/tacker/samples/tests/functional/sol_v2_common/basic_lcms_max_individual_vnfc/pkggen.py", line 41, in
<module>
    utils.make_zip(".", tmp_dir, vnfd_id, image_path=image_path,
  File "/opt/stack/tacker/tacker/tests/functional/sol_v2_common/utils.py", line 64, in make_zip
    shutil.copy(userdata_path, file_path)
  File "/usr/lib/python3.10/shutil.py", line 417, in copy
    copyfile(src, dst, follow_symlinks=follow_symlinks)
  File "/usr/lib/python3.10/shutil.py", line 254, in copyfile
    with open(src, 'rb') as fsrc:
FileNotFoundError: [Errno 2] No such file or directory:
'/opt/stack/tacker/samples/tacker/sol_refactored/infra_drivers/openstack/userdata_standard.py'
```

This is because the path to userdata_standard.py specified in pkggen.py is incorrect.
* https://opendev.org/openstack/tacker/src/branch/stable/2024.1/samples/tests/functional/sol_v2_common/basic_lcms_max_individual_vnfc/pkggen.py#L36-L37

It is necessary to correct it as follows.
```
# samples/tests/functional/sol_v2_common/sampleX
userdata_dir = "../../../../../tacker/sol_refactored/infra_drivers/openstack/"
```

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/tacker/+/925076

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/tacker/+/925076
Committed: https://opendev.org/openstack/tacker/commit/6e9bfa93c7d737aca0e954dae468027e85ad673d
Submitter: "Zuul (22348)"
Branch: master

commit 6e9bfa93c7d737aca0e954dae468027e85ad673d
Author: Ai Hamano <email address hidden>
Date: Mon Jul 29 14:35:57 2024 +0900

    Fix incorrect file path in pkggen.py

    This patch fixes the path to userdata_standard.py and
    container_update_mgmt_v2.py specified in pkggen.py
    to the correct one below.

    * userdata_standard.py
    ```
    # samples/tests/functional/sol_v2_common/sampleX
    userdata_dir =
    "../../../../../tacker/sol_refactored/infra_drivers/openstack/"
    ```

    * container_update_mgmt_v2.py
    ```
    mgmt_driver_path = os.path.join(
        cur_dir, '../../../../../tacker/sol_refactored',
        'mgmt_drivers/container_update_mgmt_v2.py')
    ```

    Closes-Bug: #2074332
    Change-Id: Iea5d417bba0e1f9a6518df59ced77d6e50ba34de