[patch] ldb in Samba3

[tridge at samba.org]

 > This one adds a test suite (in script/tests/test_groupmap.sh)

a note about this testsuite. The way I use it is to record the output
it gives when using the tdb backend (just change mapping_ldb.o to
mapping_tdb.o in the Makefile), then compare with the output when
using the ldb backend. Run 'diff -u' between the two.

It would be nicer for it to work out the correct output on the fly,
but it was too much for my sleep deprived brain last night.

This testsuite is also no good for the build farm, as it creates a
pile of local unix groups.

Cheers, Tridge