Oxp conn status change

[congwang09]

Resolves: #487, #486
Depends on: atlanticwave-sdx/sdx-lc#203

Handle status change when LC sends status update to sdx controller.

[coveralls]

Pull Request Test Coverage Report for Build 23596626709

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 20 (0.0%) changed or added relevant lines in 1 file are covered.
• 100 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.5%) to 53.373%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
sdx_controller/handlers/lc_message_handler.py	0	20	0.0%

Files with Coverage Reduction	New Missed Lines	%
sdx_controller/controllers/l2vpn_controller.py	42	52.08%
sdx_controller/handlers/connection_handler.py	58	66.0%

Totals
Change from base Build 21918320104:	-0.5%
Covered Lines:	1266
Relevant Lines:	2372

---

💛 - Coveralls

[italovalcy]

LGTM