make better condition for applying nf_conntrack kernel tweak  (#6267)
make better condition for applying nf_conntrack kernel tweak  (#6267)

* MINOR: Check kernel version before enable modprobe nf_conntrack

* CLEANUP: no more need to ignore error of this task

* MINOR: Fixing yaml and ansible lint error - remove trailling-space
kubernetes-incubator/kargo,kubernetes-incubator/kubespray,kubernetes-sigs/kubespray,kubernetes-incubator/kargo,Atoms/kubespray,kubernetes-sigs/kubespray,Atoms/kubespray,kubernetes-sigs/kubespray,Atoms/kubespray,kubernetes-incubator/kubespray,kubernetes-sigs/kubespray,Atoms/kubespray