NSX: Fix status sync with correct mappings

The code that syncs router status to the neutron_db was using the nsx
router id instead of the neutron router id thus synchronize_router
would never update the database.

Also, the switch synchronization routine was not fetching the
appropriate neutron id tag thus causing switch synchronization to
be skipped.

This patch also fixes the error in the unit tests which allowed for
the bug to be introduced.

Co-Authored-By: Salvatore Orlando <salv.orlando@gmail.com>
Closes-bug: 1283856

Change-Id: I26342ecea6ad546b224b7fca1e55f754b4883363
Merge "NSX: Fix status sync with correct mappings"