Remove Linaro email notifications

When Linaro was setting up the CI, they needed notifications to check
that things were working. Now that the CI is ticking along, they are
not monitoring those emails any longer. So, as discussed on Slack,
stop spamming Linaro.

Also don't notify the engineering team by default for release jobs in
the restricted repository. That's also a historical survivance, from
back when the release job would not send emails anyway (we used to
send emails only from the nightly job).

Change-Id: I47c029bb5a6df9d506b94ebd8273253609a4fcd2
2 files changed