Bump minimal version of ansible to 2.4.0

Currently 2.4.0 is the oldest release of ansible, everything later is
EOL. Update our meta data into include this and the platforms we
currently tests with.

Change-Id: I52501c5916f7812be0ce0fbaaec5be82aa30a093
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

meta/main.yml

@@ -19,11 +19,15 @@ galaxy_info:
     project so that changes are only merged if they pass tests.
   company: Red Hat, Inc.
   license: Apache
-  min_ansible_version: 2.0
+  min_ansible_version: 2.4
   platforms:
-  - name: EL
+  - name: Fedora
     versions:
-    - 7
+    - 27
+  - name: Ubuntu
+    versions:
+    - 16.04
+    - 18.04
   categories:
-  - cloud
+  - system
 dependencies: []

requirements.txt

@@ -1 +1 @@
-ansible>=2.0.0
+ansible>=2.4.0