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Stop looking up non-exist' SRV for CERN

Steve Traylen requested to merge straylen/cern-krb5-conf:nosrv2 into master

To avoid the following constant pointless DNS lookups:

|                 |                |              On IP DNS servers |
queries/sec during 15 min |
| aiadm99.cern.ch | 188.185.123.36 |                 --- TOTAL ---  |
79 queries/sec      |
| aiadm99.cern.ch | 188.185.123.36 |              _kerberos.cern.ch |
23.3 queries/sec     |
| aiadm99.cern.ch | 188.185.123.36 |  _kerberos-master._udp.cern.ch |
23.3 queries/sec     |
| aiadm99.cern.ch | 188.185.123.36 |  _kerberos-master._tcp.cern.ch |
23.2 queries/sec     |

It is possible that master_kdc should also be set but lets do this one step at a time. If we don't get failed lookups for it no need to set it.

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