Remove some nodesets

These have been moved to the opendev/base-jobs repo.

Depends-On: https://review.opendev.org/670381
Change-Id: I6b2b57a01ecdc181b338ac69c92cbb5a4f7dd664

zuul.d/nodesets.yaml

@@ -1,60 +1,4 @@
 # Shared nodesets specific to the OpenStack Project
-- 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-2-node
     nodes:
@@ -67,30 +11,6 @@
         nodes:
           - secondary
 
-- 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
-
 - nodeset:
     name: centos-7-2-node
     nodes: