Fix broken Fedora 27 test, clean up uninstall task.

tasks/setup-Debian.yml

@@ -1,11 +1,10 @@
 ---
 - name: Ensure old versions of Docker are not installed.
   package:
-    name: '{{ item }}'
+    name:
+      - docker
+      - docker-engine
     state: absent
-  with_items:
-    - docker
-    - docker-engine
 
 - name: Ensure dependencies are installed.
   apt:

tasks/setup-RedHat.yml

@@ -1,12 +1,11 @@
 ---
 - name: Ensure old versions of Docker are not installed.
   package:
-    name: '{{ item }}'
+    name:
+      - docker
+      - docker-common
+      - docker-engine
     state: absent
-  with_items:
-    - docker
-    - docker-common
-    - docker-engine
 
 - name: Add Docker GPG key.
   rpm_key: