Return to opt-in system for CAT tests in acceptance_tests errand.

Add opt-in for:
- security-groups
- logging
- operator

Remove defunct diego options.
Bump src/dea_next

Bump cloudfoundry/dea_ng:
  James Myers:
     Update warden-client, em-warden-client, and warden-protocol gems ( Travis created: https://travis-ci.org/cloudfoundry/dea_ng/builds/40823589 )