Don't install cockpit unless required

To avoid installing docker as dependency of cockpit-docker as in 
https://bugzilla.redhat.com/show_bug.cgi?id=1642002
Neither check the availability as it shouldn't check it for nodes with 
cri-o

roles/openshift_health_checker/openshift_checks/package_availability.py

@@ -38,10 +38,6 @@ class PackageAvailability(NotContainerizedMixin, OpenShiftCheck):
             "{rpm_prefix}-clients".format(rpm_prefix=rpm_prefix),
             "{rpm_prefix}-hyperkube".format(rpm_prefix=rpm_prefix),
             "bash-completion",
-            "cockpit-bridge",
-            "cockpit-docker",
-            "cockpit-system",
-            "cockpit-ws",
             "httpd-tools",
         ]
 

roles/openshift_node/defaults/main.yml

@@ -63,10 +63,6 @@ default_r_openshift_node_image_prep_packages:
 - glusterfs-fuse
 - device-mapper-multipath
 - nfs-utils
-- cockpit-ws
-- cockpit-system
-- cockpit-bridge
-- cockpit-docker
 - iscsi-initiator-utils
 - ceph-common
 - atomic