vfs_glusterfs: fix directory fd leak via FSP extension destructor

printing: Set default value in case of non-exisiting record

dsdb: use wellknow object IDs for new user and computer objects

bootstrap: Move to openSUSE Leap 16

bootstrap: Drop Ubuntu 20.04 in CI

s3:smb2_server: failing lease/oplock breaks should call smbd_server_connection_terminate()

buildtools: fix clang warning: argument unused

s3:printing: make printer_list.tdb none readable for others

s3:rpc_server: make epmdb.tdb non readable for others

s3:idmap_tdb2: make idmap2.tdb non readable for others

s3:idmap: make idmap.tdb non readable for others

s3:gencache: make gencache.tdb none readable for others

s3:locking: make leases.tdb none readable for others

s3:locking: make locking.tdb none readable for others

s3:idmap_autorid: make autorid.tdb none readable for others