Refactor roles and hosts

Shorten deployment time with:
- Remove redundand roles if duplicated by a dependency and vice versa
- When a member of k8s-cluster, always install docker as a dependency
  of the etcd role and drop the docker role from cluster.yaml.
- Drop etcd and node role dependencies from master role as they are
  covered by the node role in k8s-cluster group as well. Copy defaults
  for master from node role.
- Decouple master, node, secrets roles handlers and vars to be used w/o
  cross references.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

roles/kubernetes/secrets/defaults/main.yml

@@ -0,0 +1,8 @@
+# This is where all the cert scripts and certs will be located
+kube_cert_dir: "{{ kube_config_dir }}/ssl"
+
+# This is where all of the bearer tokens will be stored
+kube_token_dir: "{{ kube_config_dir }}/tokens"
+
+# This is where to save basic auth file
+kube_users_dir: "{{ kube_config_dir }}/users"