Fix kubeadm LB configure

1. join node add LB discoveryTokenAPIServers
2. kubeadm_config_api_fqdn support ipddress and domain_name

roles/kubernetes/kubeadm/templates/kubeadm-client.conf.v1alpha1.j2

@@ -3,6 +3,10 @@ kind: NodeConfiguration
 caCertPath: {{ kube_config_dir }}/ssl/ca.crt
 token: {{ kubeadm_token }}
 discoveryTokenAPIServers:
+{% if groups['kube-master'] | length > 1 and kubeadm_config_api_fqdn is defined %}
+- {{ kubeadm_config_api_fqdn }}:6443
+{% else %}
 - {{ kubeadm_discovery_address | replace("https://", "")}}
+{% endif %}
 discoveryTokenCACertHashes:
 - sha256:{{ kubeadm_ca_hash.stdout }}

roles/kubernetes/kubeadm/templates/kubeadm-client.conf.v1alpha2.j2

@@ -7,7 +7,11 @@ discoveryToken: {{ kubeadm_token }}
 tlsBootstrapToken: {{ kubeadm_token }}
 token: {{ kubeadm_token }}
 discoveryTokenAPIServers:
+{% if groups['kube-master'] | length > 1 and kubeadm_config_api_fqdn is defined %}
+- {{ kubeadm_config_api_fqdn }}:6443
+{% else %}
 - {{ kubeadm_discovery_address | replace("https://", "")}}
+{% endif %}
 discoveryTokenUnsafeSkipCAVerification: true
 nodeRegistration:
   name: {{ inventory_hostname  }}