boostrap: set ansible_python_interpreter in vars

Allows to override it locally at task level, unlike set_fact.

roles/bootstrap-os/tasks/debian.yml

@@ -62,7 +62,3 @@
     - '"changed its" in bootstrap_update_apt_result.stdout'
     - '"value from" in bootstrap_update_apt_result.stdout'
   ignore_errors: true
-
-- name: Set the ansible_python_interpreter fact
-  set_fact:
-    ansible_python_interpreter: "/usr/bin/python3"

roles/bootstrap-os/tasks/fedora-coreos.yml

@@ -38,9 +38,3 @@
     delay: 5
     sleep: 5
   when: need_bootstrap.rc != 0
-
-- name: Store the fact if this is an fedora core os host
-  set_fact:
-    is_fedora_coreos: True
-  tags:
-    - facts

roles/bootstrap-os/tasks/flatcar.yml

@@ -9,25 +9,13 @@
   tags:
     - facts
 
-- name: Force binaries directory for Flatcar Container Linux by Kinvolk
-  set_fact:
-    bin_dir: "/opt/bin"
-  tags:
-    - facts
-
 - name: Run bootstrap.sh
   script: bootstrap.sh
   become: true
   environment: "{{ proxy_env }}"
   when:
     - need_bootstrap.rc != 0
 
-- name: Set the ansible_python_interpreter fact
-  set_fact:
-    ansible_python_interpreter: "{{ bin_dir }}/python"
-  tags:
-    - facts
-
 - name: Disable auto-upgrade
   systemd:
     name: locksmithd.service

roles/bootstrap-os/vars/debian.yml

@@ -0,0 +1,2 @@
+---
+ansible_python_interpreter: "/usr/bin/python3"

roles/bootstrap-os/vars/fedora-coreos.yml

@@ -0,0 +1,2 @@
+---
+is_fedora_coreos: True

roles/bootstrap-os/vars/flatcar.yml

@@ -0,0 +1,3 @@
+---
+bin_dir: "/opt/bin"
+ansible_python_interpreter: "{{ bin_dir }}/python"

roles/bootstrap-os/vars/ubuntu.yml

@@ -0,0 +1 @@
+debian.yml