Install the missing dependencies

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

playbooks/roles/flag_build_commits/tasks/main.yml

@@ -1,3 +1,9 @@
+- name: Install required packages
+  package: name="{{ item }}" state=present
+  with_items:
+    - python2-koji
+    - python2-requests
+
 - name: Install script flagging commits on dist-git upon successful build
   copy:
       src: files/flag_commit_build.py