Retry making services created by platform admin users not counted in the list of live services

The previous migration didn’t work because the `created_by_id` column
in services references the user who created the _version_ of the
service, not who created the service originally.

This commit runs another migration to wipe all the data, and replace it
using an operation that looks at the first version of the service in the
history table, which will reference the user who actually created the
service.

migrations/versions/0284_0283_retry.py

@@ -0,0 +1,39 @@
+"""empty message
+
+Revision ID: 0284_0283_retry
+Revises: 0283_platform_admin_not_live
+Create Date: 2016-10-25 17:37:27.660723
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '0284_0283_retry'
+down_revision = '0283_platform_admin_not_live'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.execute("""
+        UPDATE
+            services
+        SET
+            count_as_live = not users.platform_admin
+        FROM
+            users, services_history
+        WHERE
+            services_history.id = services.id and
+            services_history.version = 1 and
+            services_history.created_by_id = users.id
+        ;
+    """)
+
+def downgrade():
+    op.execute("""
+        UPDATE
+            services
+        SET
+            count_as_live = true
+        ;
+    """)