CLI is not compatible with Python3

[Ekaterina Chernova]

Since urllib library changes in Python3 the following error occurred while executing bagpipe-looking-glass bgp routes:

Traceback (most recent call last):
  File "/var/lib/openstack/lib/python3.6/site-packages/networking_bagpipe/bagpipe_bgp/cli/looking_glass.py", line 156, in main
    response = urllib.request.urlopen(target_url)
AttributeError: module 'urllib' has no attribute 'request'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/var/lib/openstack/bin/bagpipe-looking-glass", line 8, in <module>
    sys.exit(main())
  File "/var/lib/openstack/lib/python3.6/site-packages/networking_bagpipe/bagpipe_bgp/cli/looking_glass.py", line 171, in main
    except urllib.error.HTTPError as e:
AttributeError: module 'urllib' has no attribute 'error'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/networking-bagpipe/+/845271

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/networking-bagpipe/+/845271
Committed: https://opendev.org/openstack/networking-bagpipe/commit/07a04d771fce8030fdd5fc495b32af05ccec8815
Submitter: "Zuul (22348)"
Branch: master

commit 07a04d771fce8030fdd5fc495b32af05ccec8815
Author: Ekaterina Chernova <email address hidden>
Date: Thu Jun 9 16:41:36 2022 +0300

    Py3: Import urllib properly

    In py3 urllib was cut to several smaller pieces:
    urllib.error
    urllib.parse
    urllib.request

    Use this import format in lookingglass, impex2dot and rest_attach CLI,
    and in common.looking_glass module.

    Closes-Bug: #1978124
    Change-Id: I98bfd8cf6be882ff7115bf8f7140917476f02dd5

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/networking-bagpipe 17.0.0.0rc1 release candidate.