Remove project pipeline definition from zuul-jobs

The pipeline for zuul-jobs is already defined in project-config, let's
use that one instead.

Change-Id: Ie29ee24b631f659f3330f5c631e2850f6b8cb463

zuul.yaml

@@ -145,78 +145,3 @@
       Do additional setup needed for multi-node jobs such as setting up
       overlay networks and setting up known-hosts and ssh keys
     pre-run: playbooks/multinode/pre
-
-####
-# zuul-jobs/project-config integration
-####
-
-- job:
-    name: base-integration
-    description: |
-      Runs roles that are included by default in the 'base' job in order to
-      prevent regressions.
-    parent: base-minimal
-    roles:
-      - zuul: openstack-infra/project-config
-    run: playbooks/integration-tests/base
-
-- job:
-    name: base-integration-centos-7
-    parent: base-integration
-    nodes:
-      - name: centos-7
-        label: centos-7
-
-- job:
-    name: base-integration-debian-jessie
-    parent: base-integration
-    nodes:
-      - name: debian-jessie
-        label: debian-jessie
-
-- job:
-    name: base-integration-fedora-26
-    parent: base-integration
-    nodes:
-      - name: fedora-26
-        label: fedora-26
-
-- job:
-    name: base-integration-opensuse423
-    parent: base-integration
-    nodes:
-      - name: opensuse-423
-        label: opensuse-423
-
-- job:
-    name: base-integration-ubuntu-trusty
-    parent: base-integration
-    nodes:
-      - name: ubuntu-trusty
-        label: ubuntu-trusty
-
-- job:
-    name: base-integration-ubuntu-xenial
-    parent: base-integration
-    nodes:
-      - name: ubuntu-xenial
-        label: ubuntu-xenial
-
-- project:
-    name: openstack-infra/zuul-jobs
-    check:
-      jobs:
-        - base-integration-centos-7
-        - base-integration-debian-jessie
-        - base-integration-fedora-26
-        - base-integration-ubuntu-trusty
-        - base-integration-ubuntu-xenial
-        - base-integration-opensuse423
-    gate:
-      jobs:
-        - base-integration-centos-7
-        - base-integration-debian-jessie
-        - base-integration-fedora-26
-        - base-integration-ubuntu-trusty
-        - base-integration-ubuntu-xenial
-        - base-integration-opensuse423