stadium: remove neutron-release from release job for stadium projects
stadium: remove neutron-release from release job for stadium projects

Now that release folks automated release process for independent
projects, we should be safe to offload the whole release management
process to openstack/releases machinery. Actually, leaving it up to
neutron-release team is error prone (f.e. we made mistakes before with
missing information in pushed git tags that held off email
announcements).

The idea of the change comes from Doug Hellmann. Quoting:

(in reference to no announcement email for networking-sfc 2.0.0)
> the email was skipped because you tagged the release by hand and the
> script didn't have the metadata it needed [...]
> this is why I want you to let us tag the releases.

Change-Id: Idc7f85fa860b3699d457ba00e800208acecb15de

eayunstack/neutron,openstack/neutron,huntxu/neutron,openstack/neutron,eayunstack/neutron,noironetworks/neutron,cloudbase/neutron,cloudbase/neutron,sebrandon1/neutron,mahak/neutron,noironetworks/neutron,huntxu/neutron,sebrandon1/neutron,mahak/neutron,mahak/neutron,openstack/neutron