Update .git review and zuul configuration.

Change-Id: I8efee18cf28344a6af44acbe1ca1d4470f7258fe

The project infrastructure is now hosted at opendev.org.

Kayobe projects have been moved from the openstack/ namespace to x/.

Change-Id: I16b523285eb34c1cd0eaf920aa4512d0ae1b4f05

This commit was bulk generated and pushed by the OpenDev sysadmins
as a part of the Git hosting and code review systems migration
detailed in these mailing list posts:

http://lists.openstack.org/pipermail/openstack-discuss/2019-March/003603.html
http://lists.openstack.org/pipermail/openstack-discuss/2019-April/004920.html

Attempts have been made to correct repository namespaces and
hostnames based on simple pattern matching, but it's possible some
were updated incorrectly or missed entirely. Please reach out to us
via the contact information listed at https://opendev.org/ with any
questions you may have.

Change-Id: If44d3bb465ab9dcc8916fd53261b1edcb9780bfb
Story: #2001637
Task: #6645