Propagate OXP response to SDX controller

[congwang09]

After sending connection request to OXP, SDX LC propagates the response back to the SDX controller, and then reflect in the place connection response.

[italovalcy]

Here is an example of an error response from Kytos:

curl -s -X POST -H 'Content-type: application/json' http://127.0.0.1:8181/api/kytos/sdx/v1/l2vpn_ptp -d '{"name": "AMPATH_vlan_503_503", "uni_a": {"port_id": "urn:sdx:port:amlight.net:Switch01:16", "tag": {"value": 4092, "tag_type": 1}}, "uni_z": {"port_id": "urn:sdx:port:amlight.net:Switch02:4", "tag": {"value": 4092, "tag_type": 1}}, "dynamic_backup_path": true}'


{"description":"Request to Kytos failed: {\"description\":\"KytosTagsAreNotAvailable, The tags [[4092, 4092]] are not available in 00:00:00:00:00:00:00:01:16\",\"code\":400}","code":400}