Remove dead variable def_kslist from two files

Remove dead variable def_kslist from two files

def_kslist was part of kdb5_create.c since its addition (commit
edf8b4d8a6a665c2aa150993cd813ea6c5cf12e1) and has always been
irrelevant since the rblock structure is fully initialized in
kdb5_create().

def_klist was copied into kdb5_ldap_realm.c (present in addition at
commit 42d9d6ab320ee3a661fe21472be542acd542d5be).  The global rblock
structure (and therefore the initializer) was removed in commit
9c850f8b62784170a5e42315c1a9552ddcf4ca2b, leaving def_kslist
unreferenced.

Remove def_kslist from both files, and remove the rblock initializer
from kdb5_create.c.

[ghudson@mit.edu: edited commit message]