set "check_mode: no" for read-only "shell" steps that registers result

"shell" step doesn't support check mode, which currently leads to failures,
when Ansible is being run in check mode (because Ansible doesn't run command,
assuming that command might have effect, and no "rc" or "output" is registered).

Setting "check_mode: no" allows to run those "shell" commands in check mode
(which is safe, because those shell commands doesn't have side effects).

roles/etcd/tasks/configure.yml

@@ -4,6 +4,7 @@
   register: etcd_member_in_cluster
   failed_when: false
   changed_when: false
+  check_mode: no
   when: is_etcd_master
   tags: facts
 

roles/etcd/tasks/gen_certs_script.yml

@@ -87,6 +87,7 @@
   args:
     executable: /bin/bash
   register: etcd_master_cert_data
+  check_mode: no
   delegate_to: "{{groups['etcd'][0]}}"
   when: inventory_hostname in groups['etcd'] and sync_certs|default(false) and
         inventory_hostname != groups['etcd'][0]
@@ -97,6 +98,7 @@
   args:
     executable: /bin/bash
   register: etcd_node_cert_data
+  check_mode: no
   delegate_to: "{{groups['etcd'][0]}}"
   when: (('calico-rr' in groups and inventory_hostname in groups['calico-rr']) or
         inventory_hostname in groups['k8s-cluster']) and

roles/etcd/tasks/set_cluster_health.yml

@@ -4,5 +4,6 @@
   register: etcd_cluster_is_healthy
   failed_when: false
   changed_when: false
+  check_mode: no
   when: is_etcd_master
   tags: facts