Remove 'deactivate_image' config options

'deactivate_image' config option was added long
back in kilo cycle and has been deprecated for
removal.
- I584cd40a9b5f297537333336b1b9a46ccf1ddc67

This commit removes it from tempest.

Change-Id: I843d4c64f24407d9d217005d5ea59d50d7ad62e7
3 files changed