WISTEST-* sets removed

The WISTEST-* OAI sets was made for presenation at CG-XVI. The sets
included OAI identifiers in operational namespace
"urn:x-wmo:md:int.wmo.wis::*" and hence caused trouble in loading the WMO
baseline metadata.

After the test sets removed, 2702 records of baseline MD was inserted into
WIS-UNASSOCIATED set. It reflects only onto the set WIS-CATALOGUE, and I
believe that won't affect synchronisation among CMA/DWD/JMA.