Enhance btree debugging output somewhat to limit key printout to the
key length if the key is not null-terminated.

Add additional test case for the zero-index page split bug; test case
can create a corrupted btree database with records unreachable by
random access but reachable by sequential access.  Requires
recompiling with CPPFLAGS='-DDEBUG -DDEBUG_IDX0SPLIT' to correctly
model mpool page reuse that would be present in production conditions.
(CPPFLAGS=-DDEBUG would otherwise explicitly overwrite the contents of
reused pages.)


Commit By: tlyu



Revision: 20222
Changed Files:
_U  trunk/
U   trunk/src/plugins/kdb/db2/libdb2/btree/bt_debug.c
U   trunk/src/plugins/kdb/db2/libdb2/mpool/mpool.c
U   trunk/src/plugins/kdb/db2/libdb2/test/run.test