nameservers: Use nmcli to update the nameserver and search info

[praveenkumar]

From 4.15, because of ovn-kubernetes the info around nameserver and search option in the /etc/resolv.conf not match with user expectation. ovs-configuration service is run on this node which is a dependency for kubelet and this make changes in the networking by creating bridge network and restarting the NetworkManager. As soon as NM restart happen, changes which are done as part of crc vm post start are vanished.

This PR is going to make sure that changes are done using nmcli and shouldn't removed when NM restart happen. Following steps are done in this PR

• Start the ovs-configuration service, even it is enabled it doesn't autostart because it only required by kubelet-dependencies.target.
• ovs-configuration service always create the network named as ovs-if-br-ex so we run the nmcli command to update this connection and add the nameserver and search option
• Restart the NM to update the /etc/resolv.conf

Fixes: Issue #4144

[openshift-ci[bot]]

@praveenkumar: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/security	e8f5701ac5db409dd834522ea9731b4cda363973	link	false	/test security

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[openshift-ci[bot]]

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