ci: Fix build of spice-protocol
spice-protocol is not using Autoconf anymore. Autobahn suite is now run on normal Fedora docker image. Drop testing with CentOS 7 i386 in favour of a Debian i386, CentOS 7 does not support i386 anymore, EPEL 7 is missing for CentOS 7 i386 so to check a 32 machine better to move to Debian.
Signed-off-by: Frediano Ziglio fziglio@redhat.com