ensure we don't keep rechecking IS_DNS_AVAILABLE and LAST_DNS_CHECK if DNS is unavailable from -L or module version issues
ensure we don't keep rechecking IS_DNS_AVAILABLE and LAST_DNS_CHECK if DNS is unavailable from -L or module version issues

git-svn-id: e9fe9b84e32fc5e57b7d09c40cd78b14ea28ed71@490719 13f79535-47bb-0310-9956-ffa450edef68

apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin