Sean Dague cdba1b3716 Remove screen support from devstack completely
This tears out the alternative path of using screen, so that we only
use systemd enabled paths. This simplifies the number of ways that
devstack can be run, and provides a much more reliable process
launcher than the screen based approach.

Change-Id: I8c27182f60b0f5310b3a8bf5feb02beb7ffbb26a
2017-09-01 15:08:17 -04:00
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