fetch-subunit-output: update include to import_tasks

Change-Id: I5a5fb6a827ae0e6c125a21bd4058e4dca602ac45

roles/fetch-subunit-output/tasks/main.yaml

@@ -44,4 +44,4 @@
       failed_when: false
 
     - name: Process and fetch subunit results
-      include: process.yaml
+      include_tasks: process.yaml

roles/fetch-subunit-output/tasks/process.yaml

@@ -1,5 +1,5 @@
 - name: Find subunit2html
-  include: find-subunit-html.yaml
+  import_tasks: find-subunit-html.yaml
 
 - name: Generate testr_results.html file
   command: "{{ subunit_html_command }} ./testrepository.subunit testr_results.html"