Rollback on failed OXP POST

[congwang09]

Resolves: #519
This PR should merge after atlanticwave-sdx/sdx-lc#204 and atlanticwave-sdx/pce#304

If OXP POST request failed, or timeout, roll back partially provisioned connection request

[coveralls]

Coverage Report for CI Build 25141820874

Coverage decreased (-2.5%) to 50.292%

Details

• Coverage decreased (-2.5%) from the base build.
• Patch coverage: 256 uncovered changes across 5 files (106 of 362 lines covered, 29.28%).
• 14 coverage regressions across 4 files.

Uncovered Changes

File	Changed	Covered	%
sdx_controller/handlers/connection_handler.py	158	62	39.24%
sdx_controller/handlers/lc_message_handler.py	90	4	4.44%
sdx_controller/controllers/l2vpn_controller.py	66	9	13.64%
sdx_controller/init.py	47	31	65.96%
sdx_controller/messaging/rpc_queue_consumer.py	1	0	0.0%

Coverage Regressions

14 previously-covered lines in 4 files lost coverage.

File	Lines Losing Coverage	Coverage
sdx_controller/handlers/connection_handler.py	5	57.98%
sdx_controller/controllers/l2vpn_controller.py	4	41.56%
sdx_controller/utils/db_utils.py	4	77.27%
sdx_controller/handlers/lc_message_handler.py	1	9.89%

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Coverage Stats

Relevant Lines:	2742
Covered Lines:	1379
Line Coverage:	50.29%
Coverage Strength:	1.01 hits per line

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💛 - Coveralls

[italovalcy]

As discussed on slack and on the weekly meeting, after reviewing this PR and their dependencies, the end-to-end tests are passing. However the mentioned issue  #519 (#519) seems still unfixed: we are still seeing the breakdowns on the OXPs after the failure. The expected behavior would be an empty reply from OXP's L2VPN. Cong mentioned that it ca be because of the merging with main branch.