Removed the port/ip extension

This provided DELETE /version/ports/<ID>/ip_address/<ID>. We determined that
this was no longer necessary.

Removed dead code and unnecessary tests

RM7654
Merge pull request #164 from roaet/remove_port_ip_extension

Removed the port/ip extension
Handle exceptions when deleting networks and ports with NVP

- if network/port doesn't exist in NVP anymore, delete from quark db
- if network/port does exist in NVP, delete from quark db and then add
  info about it to new orphaned db tables

RM6485