Check conntrack module presence instead of kernel version (#10662)

* Try both conntrack modules instead of checking kernel version

Depending on kernel distributor, the kernel version might not be a
correct indicator of the conntrack module use.
Instead, we check both (and use the first found).

* Use modproble.persistent rather than manual persistence

roles/kubernetes/node/defaults/main.yml

@@ -249,6 +249,7 @@ kube_proxy_ipvs_modules:
   - ip_vs_wlc
   - ip_vs_lc
 
-# Ensure IPVS required kernel module is picked based on Linux Kernel version
-# in reference to: https://github.com/kubernetes/kubernetes/blob/master/pkg/proxy/ipvs/README.md#run-kube-proxy-in-ipvs-mode
-conntrack_module: "{{ ansible_kernel is version_compare('4.19', '>=') | ternary('nf_conntrack', 'nf_conntrack_ipv4') }}"
+# Kubespray will use the first module of this list which it can successfully modprobe
+conntrack_modules:
+  - nf_conntrack
+  - nf_conntrack_ipv4