Add nodesets

These nodesets are currently defined in openstack-zuul-jobs but
should really be here for the convenience of all tenants.

Change-Id: Ie7fa634048304a64a1d86de22f1315e03b9e6e9c
Depends-On: https://review.opendev.org/670384

zuul.d/nodesets.yaml

@@ -0,0 +1,80 @@
+# Shared nodesets for all tenants
+- nodeset:
+    name: centos-7
+    nodes:
+      - name: centos-7
+        label: centos-7
+
+- nodeset:
+    name: debian-stable
+    nodes:
+      - name: debian-stretch
+        label: debian-stretch
+
+- nodeset:
+    name: fedora-latest
+    nodes:
+      - name: fedora-29
+        label: fedora-29
+
+- nodeset:
+    name: gentoo-17-0-systemd
+    nodes:
+      - name: gentoo-17-0-systemd
+        label: gentoo-17-0-systemd
+
+# Deprecated, please use opensuse-15 going forward
+- nodeset:
+    name: opensuse-423
+    nodes:
+      - name: opensuse-423
+        label: opensuse-423
+
+# Deprecated, please use opensuse-15 going forward
+- nodeset:
+    name: opensuse-150
+    nodes:
+      - name: opensuse-150
+        label: opensuse-150
+
+- nodeset:
+    name: opensuse-15
+    nodes:
+      - name: opensuse-15
+        label: opensuse-15
+
+- nodeset:
+    name: opensuse-tumbleweed
+    nodes:
+      - name: opensuse-tumbleweed
+        label: opensuse-tumbleweed
+
+- nodeset:
+    name: ubuntu-bionic
+    nodes:
+      - name: ubuntu-bionic
+        label: ubuntu-bionic
+
+- nodeset:
+    name: ubuntu-bionic-arm64
+    nodes:
+      - name: ubuntu-bionic-arm64
+        label: ubuntu-bionic-arm64
+
+- nodeset:
+    name: ubuntu-trusty
+    nodes:
+      - name: ubuntu-trusty
+        label: ubuntu-trusty
+
+- nodeset:
+    name: ubuntu-xenial-arm64
+    nodes:
+      - name: ubuntu-xenial-arm64
+        label: ubuntu-xenial-arm64
+
+- nodeset:
+    name: ubuntu-xenial
+    nodes:
+      - name: ubuntu-xenial
+        label: ubuntu-xenial