New OSE3 docker host builder and OpenStack ansible provisioning support

roles/common/pre_tasks/pre_tasks.yml

@@ -0,0 +1,4 @@
+---
+- name: Generate Environment ID
+  shell: echo "$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c 8)"
+  register: env_random_id