NEC plugin: Rename quantum_id column to neutron_id

ID mapping tables in NEC plugin had columns named quantum_id.
This commit renames them to neutron following project renaming.

Closes-Bug: #1287432
Change-Id: I0669defba7189d5b8259365d88d67db51a28c764
Add nec plugin to allowed address pairs migration

Change-Id: I2a6488482abacf87fc27fb3211041d81a4c1c047
Closes-Bug: #1295999
Merge "NEC plugin: Rename quantum_id column to neutron_id"
Merge "Add nec plugin to allowed address pairs migration"