bootstrap: rework role (#4045)

* bootstrap: rework role

* support being called from a non-root user
* run some commands in check mode
* unify spelling/task names

* bootstrap: fix wording of comments for check_mode: false

* bootstrap: remove setup-pipelining task

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

@@ -5,3 +5,4 @@
     state: present
   with_items:
     - python-cryptography
+  become: true