Bug 6536: Adjustments for servername and servertype

Bug 6536: Adjustments for servername and servertype

Replaces name by servername, type by servertype for running Z3950 search.
Limit search scripts to zed (z3950) servers until sru is supported.

Test plan:
Perform a Z3950 search in Cataloguing and Acquisition.
Verify that it still works as it did.

Signed-off-by: Giuseppe Angilella <giuseppe.angilella@ct.infn.it>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>