private RRset []
findRecords(Name name, int type, int minCred) {
	SetResponse cr = lookupRecords(name, type, minCred);
	if (cr.isSuccessful())
		return cr.answers();
	else
		return null;
}
Looks up Records in the Cache.  This follows CNAMEs and handles negatively
cached data.
@param name The name to look up
@param type The type to look up
@param minCred The minimum acceptable credibility
@return A SetResponse object
@see SetResponse
@see Credibility
src/main/java/core/org/xbill/DNS/Cache.java