[switch_config] Fix pip install

If the reproducer runs in a venv the pip install will
fail as we are passing the --user option to pip.
As we are not usign become: true in the install task
enforcing --user is not needed, since pip will install
the dependencies inside the user site-packages as the
root one is not writable.

playbooks/switches_config.yml

@@ -16,7 +16,6 @@
         name:
           - paramiko
           - ncclient
-        extra_args: --user
 
 - name: Switches configuration
   hosts: switches