[OBS]: Folder creation and management fix

[artem-lifshits]

FIx folder creation and deletion for OBS.
Includes:

• create_object
• delete_object

Refers to: #401

Unit tests

pep8: OK (33.97=setup[20.29]+cmd[12.12,1.56] seconds)
py3: OK (24.78=setup[15.43]+cmd[9.13,0.22] seconds)
congratulations :) (58.84 seconds)

[otc-zuul]

Build failed.
https://zuul.otc-service.com/t/eco/buildset/fde1dbd8d28e46a29a7ee76b09863eab

❌ otc-tox-docs POST_FAILURE in 8m 01s
❌ otc-tox-py38 POST_FAILURE in 8m 40s
❌ otc-tox-pep8 POST_FAILURE in 7m 38s
❌ tox-functional-eu-de RETRY_LIMIT in 1m 58s
❌ otce-upload-image POST_FAILURE in 3m 29s

[artem-lifshits]

Regate

[otc-zuul]

Build failed.
https://zuul.otc-service.com/t/eco/buildset/e592cea38bc54b65b9fe74dc557becad

❌ otc-tox-docs POST_FAILURE in 8m 44s
❌ otc-tox-py38 POST_FAILURE in 8m 43s
❌ otc-tox-pep8 POST_FAILURE in 7m 12s
❌ tox-functional-eu-de RETRY_LIMIT in 2m 01s
❌ otce-upload-image POST_FAILURE in 3m 35s

[artem-lifshits]

Regate

[otc-zuul]

Build succeeded.
https://zuul.otc-service.com/t/eco/buildset/85b48e2b45fb499bbe9d11e6c4841217

✔️ otc-tox-docs SUCCESS in 14m 00s
✔️ otc-tox-py38 SUCCESS in 7m 08s
✔️ otc-tox-pep8 SUCCESS in 7m 03s
✔️ tox-functional-eu-de SUCCESS in 9m 37s
✔️ otce-upload-image SUCCESS in 3m 30s