In RHEL 8.4, /etc/resolv.conf is not present by default.
As such, removing the nameservers will fail because
etc/resolv.conf.ORIG never gets created.
This patch makes the nameserver edit only if the
etc/resolv.conf.ORIG file exists.
Change-Id: I2178996d899ffe43e11bfeb512e4fcaa941b8410