Describe addresses in ec2 api broken with neutron

It attempts to retrieve the fixed ip directly,
but it's not supported by neutron.

After the modification,
the instance uuid will be pulled without using get_fixed_ip().

Change-Id: Ia1b95d4c18aeb5012919af89148947694d80e2e7
Closes-Bug: #1273837
Merge "Describe addresses in ec2 api broken with neutron"