Change staging tests to use all auth dns servers

test/test-config/getssl-staging-dns01-fail-dns-add.cfg

@@ -5,7 +5,7 @@ CA="https://acme-staging-v02.api.letsencrypt.org/directory"
 # Generic staging config
 VALIDATE_VIA_DNS=true
 DNS_DEL_COMMAND="/getssl/dns_scripts/dns_del_duckdns"
-AUTH_DNS_SERVER=ns2.duckdns.org
+PUBLIC_DNS_SERVER=ns2.duckdns.org
 CHECK_ALL_AUTH_DNS=true
 
 # Test that the retry works (dns_add_command will always fail)

test/test-config/getssl-staging-dns01-no-suffix.cfg

@@ -5,7 +5,7 @@ CA="https://acme-staging-v02.api.letsencrypt.org"
 VALIDATE_VIA_DNS=true
 DNS_ADD_COMMAND="/getssl/dns_scripts/dns_add_duckdns"
 DNS_DEL_COMMAND="/getssl/dns_scripts/dns_del_duckdns"
-AUTH_DNS_SERVER=ns2.duckdns.org
+PUBLIC_DNS_SERVER=ns2.duckdns.org
 CHECK_ALL_AUTH_DNS=true
 DNS_EXTRA_WAIT=120
 

test/test-config/getssl-staging-dns01.cfg

@@ -5,7 +5,7 @@ CA="https://acme-staging-v02.api.letsencrypt.org/directory"
 VALIDATE_VIA_DNS=true
 DNS_ADD_COMMAND="/getssl/dns_scripts/dns_add_duckdns"
 DNS_DEL_COMMAND="/getssl/dns_scripts/dns_del_duckdns"
-AUTH_DNS_SERVER=ns2.duckdns.org
+PUBLIC_DNS_SERVER=ns2.duckdns.org
 CHECK_ALL_AUTH_DNS=true
 DNS_EXTRA_WAIT=120