tests/installed: Move tasks into tasks/ directory

It's cleaner to separate test playbooks from their tasks.

Closes: #1535
Approved by: jlebon

tests/installed/destructive.yml

@@ -8,7 +8,10 @@
     use_git_build: True
     tests: "."
   tasks:
-    - import_tasks: overlay-git.yml
+    - import_tasks: tasks/query-host.yml
+    - set_fact:
+        rpmostree_initial_deployment: "{{ rpmostree_status[\"deployments\"][0] }}"
+    - import_tasks: tasks/overlay-git.yml
       when: use_git_build
     # Next copy all of the tests/ directory
     - name: Copy test data

tests/installed/nondestructive.yml

@@ -10,7 +10,8 @@
     # Arbitrary...we want some parallelism
     batching_factor: 4
   tasks:
-    - import_tasks: overlay-git.yml
+    - import_tasks: tasks/query-host.yml
+    - import_tasks: tasks/overlay-git.yml
       when: use_git_build
     # Next copy all of the tests/ directory
     - name: Copy test data

tests/installed/tasks/query-host.yml

@@ -0,0 +1,5 @@
+- command: rpm-ostree status --json
+  changed_when: False
+  register: rpmostree_status_json
+- set_fact:
+    rpmostree_status: "{{ rpmostree_status_json.stdout | from_json }}"