Stress ssh_floating test

Add stress test for floating IP association
 with multiple configuration options.

Change-Id: I184ce2df1ee58043cf9b26c46637c1d8160910e8
Add more detailed message about the volumes missing

Instead of just showing the ones that were missing,
show the ones that were expected, the list that was
retrieved and the difference in one message. This
makes it much easier to see what the failure was.

Change-Id: I3ecb39fd2347af265f72e072e4827946c10fb2f6
Add handling for inherited stress attributes

In some cases inheritance is used for test cases (like XML/JSON tests).
For many of those cases inherited stress attribute are misleading
since they will execute nearly the same load on the system.

To avoid this issue we skip all inherited stress attributes by default
and add parameters to deactivate this on a global level and function
level.

Change-Id: I4260844ed15917106436d836c939157e32a59554
Fixes: bug #1219402
Merge "Stress ssh_floating test"
Merge "Add handling for inherited stress attributes"
Merge "Add more detailed message about the volumes missing"