ci: Avoid using pip as root

There's absolutely no reason to have the pip installation and any kind
of docker usage requiring root.

Docker must be properly configured, following:
https://docs.docker.com/engine/install/linux-postinstall/

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

tests/e2e/ansible/start_docker_registry.yaml

@@ -7,7 +7,6 @@
 #
 ---
 - hosts: all
-  become: yes
   vars:
     local_registry_port: 5000
     local_registry_name: local-registry