[SCM] Samba Shared Repository - branch v3-0-test updated - release-3-0-32-11-g0b39c04

[tridge at samba.org]

Hi Simo,

 > Please revert this change immediately. That change would slow down tdb
 > by a couple of orders or magnitude for our temporary databases.

actually this will only slow us down each time we attach/detach to the
tdb or we expand it (as expand uses munmap/mmap). I guess the question
is how often we expand our temporary tdb's.

A simple change would be for this not to apply if TDB_CLEAR_IF_FIRST
is set.

Cheers, Tridge