5e831f1 Do not crash when Kerberos SRV record is not found

Authored and Committed by mkosek 11 years ago
    Do not crash when Kerberos SRV record is not found
    
    ipa-client-install crashed when IPA server realm TXT record was
    configured, but the referred domain (lower-case realm value) did
    not contain any Kerberos SRV record (_kerberos._udp.<realm>.)
    
    https://fedorahosted.org/freeipa/ticket/3316