feat: k0s remove isolated controllers support and ansible prepare playbook (#1205)

Signed-off-by: Devin Buhl <devin@buhl.casa>

bootstrap/templates/kubernetes/k0s/resources/hooks/reset-cilium.sh.j2

@@ -0,0 +1,40 @@
+#% if bootstrap_distribution == 'k0s' %#
+#!/usr/bin/env bash
+
+[ $(id -u) -eq 0 ] || exec sudo $0 $@
+
+remove_interfaces() {
+  ip link show 2>/dev/null | grep 'cilium' | while read ignore iface ignore; do
+      iface=${iface%%@*}
+      [ -z "$iface" ] || ip link delete $iface
+  done
+}
+
+reset_iptables() {
+    iptables -t nat -F
+    iptables -t mangle -F
+    iptables -t filter -F
+    iptables -t raw -F
+    iptables -X
+    ip6tables -t nat -F
+    ip6tables -t mangle -F
+    ip6tables -t filter -F
+    ip6tables -t raw -F
+    ip6tables -X
+}
+
+do_unmount_and_remove() {
+    set +x
+    while read -r _ path _; do
+        case "$path" in $1*) echo "$path" ;; esac
+    done < /proc/self/mounts | sort -r | xargs -r -t -n 1 sh -c 'umount -f "$0" && rm -rf "$0"'
+    set -x
+}
+
+do_unmount_and_remove '/run/netns/cni-'
+ip netns show 2>/dev/null | grep cni- | xargs -r -t -n 1 ip netns delete
+remove_interfaces
+reset_iptables
+rm -rf /var/lib/cni
+rm -rf /etc/cni/net.d
+#% endif %#