PR#2175: kojira: remove duplicate Kerberos configuration boilerplate

Merges #2175
https://pagure.io/koji/pull-request/2175

docs/source/server_howto.rst

@@ -1313,11 +1313,19 @@ Authentication Configuration
 
 ::
 
-    ; For Kerberos authentication
-    ; the principal to connect with
-    principal=koji/kojira@EXAMPLE.COM
-    ; The location of the keytab for the principal above
-    keytab=/etc/kojira.keytab
+    ;configuration for Kerberos authentication
+
+    ;the kerberos principal to use
+    ;principal = kojira@EXAMPLE.COM
+
+    ;location of the keytab
+    ;keytab = /etc/kojira/kojira.keytab
+
+    ;the service name of the principal being used by the hub
+    ;krbservice = host
+
+    ;The realm of server principal. Using client's realm if not set
+    ;krb_server_realm = EXAMPLE.COM
 
 ``/etc/sysconfig/kojira``
     The local user kojira runs as needs to be able to read and write to

util/kojira.conf

@@ -3,12 +3,6 @@
 ; user=kojira
 ; password=kojira
 
-; For Kerberos authentication
-; the principal to connect with
-principal=koji/repo@EXAMPLE.COM
-; The location of the keytab for the principal above
-keytab=/etc/kojira.keytab
-
 ; The URL for the koji hub server
 server=http://hub.example.com/kojihub