tests: Fix incorrect fixture sequence for production setup.
tests: Fix incorrect fixture sequence for production setup.

1. It was not cleaning up the old environment.

2. It was setting the namespace permanently to "testprod", which,
   although it should not misbehave in any way, is misleading, and
   unnecessary, since it will be kept by subsequent unrelated tests.

Changelog: None

Signed-off-by: Kristian Amlie <505e66ae45028a0596c853559221f0b72c1cee21@northern.tech>

pasinskim/integration,pasinskim/integration,GregorioDiStefano/integration,GregorioDiStefano/integration,pasinskim/integration