Running the code style syntax-check as part of the build jobs leads to
all jobs failing in the same way. Have a prebuild job for validating
syntax-check to catch code style problems upfront and thus avoid needing
to run all the build jobs.
Reviewed-by: NErik Skultety <eskultet@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>a
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>