Convert Floating IP tests to httpretty

Change-Id: I0f6816868580af32ee93c0bfdf2c113c6c6ecd13
blueprint: httpretty-testing
Convert Floating IPs DNS tests to httpretty

Change-Id: I19dfadbe9103145a6b80d8ce10d2b6d3ce326ffa
blueprint: httpretty-testing
Merge "Convert Floating IP tests to httpretty"
Merge "Convert Floating IPs DNS tests to httpretty"