Deprecate Fedora based Docker images

Change-Id: I84f01a93656ed9c9d828b4619753cb1bb806f74f
Partial-bug: #1616387

doc/image-building.rst

@@ -50,6 +50,11 @@ There are following distros available for building images:
 - oraclelinux
 - ubuntu
 
+.. warning::
+
+   Fedora images are deprecated since Newton and will be removed
+   in the future.
+
 To push the image after building, add ``--push``::
 
     kolla-build --push

kolla/image/build.py

@@ -516,6 +516,10 @@ class KollaWorker(object):
                 '{} is unavailable for {}'.format(self.install_type, self.base)
             )
 
+        if self.base == 'fedora':
+            LOG.warning('Fedora images are deprecated since Newton and will '
+                        'be removed in the future')
+
         if self.install_type == 'binary':
             self.install_metatype = 'rdo'
         elif self.install_type == 'source':

releasenotes/notes/deprecate-fedora-97f8f963a410eb44.yaml

+---
+deprecations:
+  - Fedora based Docker images are deprecated as of the
+    Newton release and will be removed during the Ocata
+    cycle. Further details below the following URL
+    http://lists.openstack.org/pipermail/openstack-dev/2016-September/104011.html