Configurable IPVS timeouts

[fulii]

What would you like to be added:

• I'd like the option to configure IPVS timeouts in the role/kubernetes/master/templates/kubeadm-config.v1beta2.yaml.j2 file.
• With changing the template for kubeproxy.config.k8s.io/v1alpha1/KubeProxyConfiguration manifest.

Current:

ipvs:
  excludeCIDRs: {{ kube_proxy_exclude_cidrs }}
  minSyncPeriod: {{ kube_proxy_min_sync_period }}
  scheduler: {{ kube_proxy_scheduler }}
  syncPeriod: {{ kube_proxy_sync_period }}
  strictARP: {{ kube_proxy_strict_arp }}

Proposed:

ipvs:
  excludeCIDRs: {{ kube_proxy_exclude_cidrs }}
  minSyncPeriod: {{ kube_proxy_min_sync_period }}
  scheduler: {{ kube_proxy_scheduler }}
  syncPeriod: {{ kube_proxy_sync_period }}
  strictARP: {{ kube_proxy_strict_arp }}
  tcpTimeout: {{ kube_proxy_tcp_timeout }}
  tcpFinTimeout: {{ kube_proxy_tcp_fin_timeout }}
  udpTimeout: {{ kube_proxy_udp_timeout }}

Why is this needed:

• Currently IPVS timeouts has to be configured manually with ipvsadm and the settings are lost on restart.