zuul.d/projects.yaml: remove x/networking-6wind entry
zuul.d/projects.yaml: remove x/networking-6wind entry

The following commit in x/networking-6wind 3b8f98af1c6d
("Fix dup dependency in requirements.txt, align unit tests")
adds .zuul.yaml with updated opendev CI Zuul jobs list. So no longer need to
maintain x/networking-6wind entry in the global zuul.d/projects.yaml.

Change-Id: I9fc4a14ae21d3b069db1fed12136b6cc787ae599
Signed-off-by: Valentina Krasnobaeva <09032b9d6a32fe0c834a09444c596a821fe971bb@6wind.com>
Acked-by: Maxime Leroy <456097398e25fafb4037134ee0199bc711bfd454@6wind.com>

openstack-infra/project-config,openstack-infra/project-config