Add devel branches and override-checkout for ansible-devel job
Add devel branches and override-checkout for ansible-devel job

Ansible uses the branch 'devel' for the main branch. Without listing it
in branches, zuul doesn't consider it to be a matching change.

Also, devstack should always come from master, as should shade.

Change-Id: Ie61fc55ff12b0074a82d878e86a47a092e091e7a

openstack-infra/shade,openstack-infra/shade