Add valid search when search does not exist on resolv.conf

[nak3]

Current fix #5433 still misses to add search cluster.local. The logic needs to be:

1. When search does not exist, adds search cluster.local.
2. When search.*.cluster.local does not exist, adds(sed) cluster.local.

in this order.

cc @sdodson @caruccio

[nak3]

Here is a test script to confirm current bug for saving your time. This will not add search cluster.local.

test.sh

NEW_RESOLV_CONF=resolv.conf

# current script
if ! grep -q 'search.*cluster.local' ${NEW_RESOLV_CONF}; then
	sed -i '/^search/ s/$/ cluster.local/' ${NEW_RESOLV_CONF}
elif ! grep -qw search ${NEW_RESOLV_CONF}; then
        echo 'search cluster.local' >> ${NEW_RESOLV_CONF}
fi

## fixed script
#if ! grep -qw search ${NEW_RESOLV_CONF}; then
#        echo 'search cluster.local' >> ${NEW_RESOLV_CONF}
#elif ! grep -q 'search.*cluster.local' ${NEW_RESOLV_CONF}; then
#	sed -i '/^search/ s/$/ cluster.local/' ${NEW_RESOLV_CONF}
#fi

resolv.conf

# Generated by NetworkManager
nameserver 192.168.122.1

[ingvagabund]

/retest

[sdodson]

/kind bug
/lgtm

[openshift-merge-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[openshift-merge-robot]

Automatic merge from submit-queue.