Switch to use upstream kube_feature_gates logic

roles/kubernetes/control-plane/templates/kubeadm-config.v1beta2.yaml.j2

@@ -92,8 +92,8 @@ networking:
   podSubnet: "{{ kube_pods_subnet }}{{ ',' + kube_pods_subnet_ipv6 if enable_dual_stack_networks }}"
 {% if kube_feature_gates %}
 featureGates:
-{%   for kube_feature_gate in kube_feature_gates %}
-  {{ kube_feature_gate.split("=")[0] }}: {{ kube_feature_gate.split("=")[1] }}
+{%   for feature in kube_feature_gates %}
+  {{ feature|replace("=", ": ") }}
 {%   endfor %}
 {% endif %}
 kubernetesVersion: {{ kube_version }}
@@ -371,12 +371,6 @@ conntrack:
   tcpCloseWaitTimeout: {{ kube_proxy_conntrack_tcp_close_wait_timeout }}
   tcpEstablishedTimeout: {{ kube_proxy_conntrack_tcp_established_timeout }}
 enableProfiling: {{ kube_proxy_enable_profiling }}
-{% if kube_feature_gates %}
-featureGates:
-{%   for kube_feature_gate in kube_feature_gates %}
-  {{ kube_feature_gate.split("=")[0] }}: {{ kube_feature_gate.split("=")[1] }}
-{%   endfor %}
-{% endif %}
 healthzBindAddress: {{ kube_proxy_healthz_bind_address }}
 hostnameOverride: {{ kube_override_hostname }}
 iptables:
@@ -426,7 +420,7 @@ clusterDNS:
 {% endfor %}
 {% if kube_feature_gates %}
 featureGates:
-{%   for kube_feature_gate in kube_feature_gates %}
-  {{ kube_feature_gate.split("=")[0] }}: {{ kube_feature_gate.split("=")[1] }}
+{%   for feature in kube_feature_gates %}
+  {{ feature|replace("=", ": ") }}
 {%   endfor %}
 {% endif %}