Fixes for updates of KADM5_KVNO but not KEY_DATA and vice-versa.

It turns out that updates of kvno but not key data and vice-versa are
both, allowed and actually done (e.g, in kadmin's ank).  Doing the right
thing in these cases turns out to be a bit tricky, but this commit ought
to do it.

lib/kadm5/common_glue.c

@@ -258,7 +258,7 @@ kadm5_setkey_principal_3(void *server_handle,
 	return KADM5_SETKEY3_ETYPE_MISMATCH;
 
     ret = kadm5_get_principal(server_handle, princ, &princ_ent,
-                              KADM5_PRINCIPAL | KADM5_KEY_DATA);
+                              KADM5_KVNO | KADM5_PRINCIPAL | KADM5_KEY_DATA);
     if (ret)
 	return ret;