Fix tox.ini
Fix tox.ini

The pytest command in the tox.ini file was too permissive.
For development the dci_databrowser project download some py files
which were caught by pytest and complicates the test running locally.

Change-Id: I2d1f4b32747522df954c7e2b24964929a41d7f04

enovance/dci-control-server,enovance/dci-control-server,redhat-cip/dci-control-server,redhat-cip/dci-control-server