Fixed auth on read, update, delete on networks

RM9709
RM9725 update

Modifies the traceback shown to the user when an
ethertype/remote_ip_prefix mismatch occurs.
Merge pull request #239 from Cerberus98/master

RM9725 update
Create port with fixed_ips with ip_address optional

RM9839
Merge pull request #240 from sumanthns/fixed_ip_with_just_subnet

Create port with fixed_ips with ip_address optional
Merge pull request #236 from asadoughi/9709

Fixed auth on read, update, delete on networks