Ensure tempest tests don't assume IP address allocation strategy
With the advent of pluggable IPAM in Neutron, it is not safe to
assume any particular algorithm is used to allocate IP addresses.
This change ensures the fixed IP sent to Neutron when we need a
specific fixed IP doesn't conflict as it is unsafe to simply take
the numerically highest IP address and add 1 to it. This change
introduces a helper method that finds an IP address not in use,
making it so we can safely ask for that specific IP address.
Change-Id: I84195b0eb63b7ca6a4e00becbe09e579ff8b718e
Partial-Bug: #1543094
3 files changed