Adds unit test for negative class decorator

Partially implements bp unit-tests

Change-Id: I5ce11fb00f2fd18851ec3a684618bdddec6ed6b0
Network fwaas API test

This patch implements basic CRUD (json/xml) API tests for -
firewall-rule api
firewall-policy api
firewall api

Change-Id: I97121ae92da00f84d05eba2b8992c0d77443fa6a
Unskip load balancer basic scenario test

Corresponding bug 1294603 was fixed by commit
I0dc4d01b0c1c04887ec6ad5766ec7c6c96903faa

Due to recent changes in neutron and nova which
fixed security groups for ml2 plugin
If004db60e084f4cea095ca9ecccb0537240d4183 and I3bbcfc67036ab7389c82720add0bc0fc627bfee0,
one should create security group rules to allow traffic on specific tcp port.
So patch adds rules to allow ingress traffic
for ports 80 and 88.

Closes-Bug: #1294603
Change-Id: Idff6d27611adda502e6e3f7e0d37f3acbda41d03
Merge "Network fwaas API test"
Merge "Unskip load balancer basic scenario test"
Merge "Adds unit test for negative class decorator"
Merge branch 'master' of https://github.com/openstack/tempest