zOs/TX/WK960

* new index with clustering,
*     but target has already clustering index
* ==> validate should complain
*
*      index IQZ91WK960A1 if phase = 1 or >= 3
*      index IQZ91WK960A2 if phase >= 2
*        clustered yes = index  $phase // 2
=DQ0G=0
creDb trg 4
+ ok creDb DSN.TX.GENF(WK960t4) ::f
creDb src 10
+ ok creDb DSN.TX.GENF(WK960s10) ::f