New changes on survior metric

The survivor metric has changed during implementation.
This patchset will implement the new metric.

Card 701 on mingle is updated.

Implementation now matches card 701.

Added action for /demo/create/survivors/ , to create a scenario for
testing the survivor metric.

Removed pprint and cruft from code.

Fixed flake8 warnings/errors.

Changed survivor namespace to 0 to cope with default demo controller.

Change-Id: I25e2d0604b2bd2e18ae9510459af0ca96c316e9b
Merge "New changes on survior metric"