ci: Rebase to f25

This is now the devel target, plus I think this may fix some of the
ASAN issues I'm seeing; I mostly have been using f25 for local
testing.

Also remove the MAINTAINER line since the maintainers are defined by
`git log`.

Closes: #631
Approved by: jlebon

.redhat-ci.Dockerfile

@@ -1,5 +1,4 @@
-FROM fedora:24
-MAINTAINER Jonathan Lebon <[email protected]>
+FROM fedora:25
 
 RUN dnf install -y \
         gcc \