Fix tasks to avoid ansible warning about raw module environment (#3545)

roles/bootstrap-os/tasks/bootstrap-ubuntu.yml

@@ -15,7 +15,7 @@
   failed_when: false
   changed_when: false
   with_items: "{{ubuntu_packages}}"
-
+  environment: {}
   tags:
     - facts
 
@@ -23,6 +23,7 @@
   raw:
     apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y {{ubuntu_packages | join(" ")}}
+  environment: {}
   when:
     - need_bootstrap.results | map(attribute='rc') | sort | last | bool