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 24919728481

Coverage decreased (-2.1%) to 50.725%

Details

• Coverage decreased (-2.1%) from the base build.
• Patch coverage: 209 uncovered changes across 5 files (89 of 298 lines covered, 29.87%).
• 14 coverage regressions across 4 files.

Uncovered Changes

File	Changed	Covered	%
sdx_controller/handlers/connection_handler.py	139	48	34.53%
sdx_controller/handlers/lc_message_handler.py	87	4	4.6%
sdx_controller/controllers/l2vpn_controller.py	24	6	25.0%
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	57.55%
sdx_controller/controllers/l2vpn_controller.py	4	47.34%
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:	2691
Covered Lines:	1365
Line Coverage:	50.72%
Coverage Strength:	1.01 hits per line

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💛 - Coveralls