ansible/simtest: remove pip install logic
The pip install logic fails with:
:stderr: error: externally-managed-environment
Remove this. Dependencies are installed venv/virtualenv:
https://gitea.osmocom.org/sim-card/pysim/src/commit/c50f4b4a0222a964710ce3124a66fe13c804be65/contrib/jenkins.sh#L25-L30
Change-Id: I460e22d78966d14e02b639efc4f74d7356e22f28
