How to modify krb5.conf in MCS provisioned linux VDA

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Instructions

1) Boot up the master image
2) Edit the file /var/xdl/mcs/ad_join.sh and edit the function conf_winbind.
3) Under the section [ # Customize /etc/krb5.conf ] , add the relevant customization like below

    # Customize /etc/krb5.conf
    echo "[libdefaults]
    default_realm = $REALM

    #custom entries
    dns_lookup_kdc = true
    dns_lookup_realm = true
    #done

    default_ccache_name = FILE:/tmp/krb5cc_%{uid}

4) save the changes
5) Update the master catalog from studio.
6) New machines should reflect the changes in kerberos configuration file