vagrant/ansible: do not use filter, but "is"

Ansible complains that checking the return value of a filter action is
deprecated. It seems required to use "is" instead of the pipe ("|").

    [DEPRECATION WARNING]: Using tests as filters is deprecated. Instead of using
    `result|version_compare` use `result is version_compare`. This feature will be
    removed in version 2.9. Deprecation warnings can be disabled by setting
    deprecation_warnings=False in ansible.cfg.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

vagrant/gcr_proxy.yml

@@ -7,7 +7,7 @@
     - include_role:
         name: master
         tasks_from: gcr_proxy.yml
-      when: custom_registry_gcr | default(false)
+      when: custom_registry_gcr is default(false)
 
 - hosts: nodes
   become: yes
@@ -18,4 +18,4 @@
     - include_role:
         name: nodes
         tasks_from: gcr_proxy.yml
-      when: custom_registry_gcr | default(false)
+      when: custom_registry_gcr is default(false)

vagrant/roles/common/tasks/main.yml

@@ -137,11 +137,11 @@
 
   - name: install fixed kubelet-kubeadm config file (1.8 and later)
     copy: src=10-kubeadm-post-1.8.conf dest=/etc/systemd/system/kubelet.service.d/10-kubeadm.conf owner=root group=root mode=644 backup=yes
-  when: kube_ver.stdout | version_compare('1.8', '>=')
+    when: kube_ver.stdout is version_compare('1.8', '>=')
 
 - name: install fixed kubelet-kubeadm config file
   copy: src=10-kubeadm.conf dest=/etc/systemd/system/kubelet.service.d/ owner=root group=root mode=644 backup=yes
-  when: kube_ver.stdout | version_compare('1.8', '<')
+  when: kube_ver.stdout is version_compare('1.8', '<')
 
 - name: copy docker conf
   template: src=docker.j2 dest=/etc/sysconfig/docker force=yes mode=0644