[release] fedmsg: 0.16.2

[Ralph Bean]

0.16.2
------

This release fixes a couple of errors that periodically get raised from calls
to `fedmsg.tail_messages(...)`.

Pull Requests

- (@ralphbean)      #354, Try three times to get the CRL.
  https://github.com/fedora-infra/fedmsg/pull/354
- (@ralphbean)      #356, Stop yielding None values from fedmsg.tail_messages.
  https://github.com/fedora-infra/fedmsg/pull/356

Commits

- ecf7f30be Try three times to get the CRL.
  https://github.com/fedora-infra/fedmsg/commit/ecf7f30be
- 2bf4bfb6f Stop yielding None values from fedmsg.tail_messages.
  https://github.com/fedora-infra/fedmsg/commit/2bf4bfb6f