[CLOUD-3016] default to using dns.DNS_PING

[luck3y]

https://issues.jboss.org/browse/CLOUD-3016
Signed-off-by: Ken Wills kwills@redhat.com

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[luck3y]

@rhusar FYI

[luck3y]

This is waiting on jboss-openshift/cct_module#319

[rhusar]

@luck3y LGTM!